Well there are tons of them besides the one you mentioned, illegal use and high volatility which brings huge risks to your investment (but hey, you can bring this price fluctuations to your own advantage). One of the main reason is that we have no clue whats written on the faith on bitcoin on the future. Any huge step taken by the government or the bank can actually destroy bitcoin. By destroying it i mean the price, they can make it valueless. Another reason is if you don't know what you are handling, then don't invest. You might end up losing all you have.

You realized it just now? I have been using very low fee for last few transactions and the confirmation speed was amazing compared to previous fee and time. The average fee i have using is around 25 sat/b. The fee did go high momentarily when the price of bitcoin spiked, but looks like its normal right now. By the way, you can use https://bitcoinfees.earn.com/ to know the estimate fee and confirmation time based on current network situation.

How easy is it to access your account? I mean was there any additional security layer on your account like two factor mobile authentication or email notification when someone from unknown device accessed your account? Or at least an email approval when withdrawing from your exchange. All these additional security level should exist in an exchange, or else you should avoid that exchange. And if it does exist and it is you who did not enable them, then its actually your fault. The hacker somehow got hold of your credentials and hacked your account. Maybe you used the same Login information on different sites and one of those sites had their database leaked.
Again, think about it this way. If they let you have  a refund, then imagine how many people are going to abuse it. They will say that their coins where hacked (despite it was them who sold their coins and cashed out) and ask for a refund.
Sorry to say, but the chances are low of you getting back your coins. I know its very frustrating, but the best thing to do is move on and stop crying over spilt milk, you will just end up with more losses. Since you believe that the price of HBZ will eventually skyrocket anytime soon, but the price has dropped for now, then use this opportunity to buy and sell it when the price goes up.

Warren Buffett thinks that investing bitcoin is like gambling, what else can you expect from him? His words might be true if you think in short run, but think about the long run. As long as people are starting to adopt crypto currencies, the prices are bound to go up and that is not a speculation, but a truth.

We don't which coin may takeover bitcoin in the future, but i do know that its not going to be ripple or XRP. A "centralized"(ripple having control over 60% of the coins does make it centralized) coin can never take over bitcoin. Even Stellar/XLM has better chance to take over bitcoin than XRP.

I guess anyone who heard about bitcoin and other crypto currencies does know that they do not exist physically and is just a digital currency used to reflect the balance of its associated address.  But you did explain well how the transactions and balanced are updated.

Good thing they will pay their employees in crypto currencies, but i do hope that all their employees knows the risks of accepting it as salary and the company has explained those risks to them and also signed up legal terms where the employees can not sue them in anyway if the market crashes or something bad happens. Many legal issues might rise specially FLSA laws (does not apply in Japan, not sure though) which might create a huge havoc.

We don't know if Bitcoin will remain the top crypto currency in the future or not. People always tends to trust things that has been on the market for a long time. They are we known and well spread. New technologies kinda make people a bit suspicious and they do not wish to use them as long as they are not well established in the market for a long term. For now bitcoin will be holding the market as a leader, but not sure who will take over in the future.

Its best not to completely trust an online wallet. You better pay fees from your desktop wallets or other wallets (where you have full control of your funds and private keys), than be sorry latter. There might be a chance of online wallets getting hacked or going down (coinbase users actually know how it feels, as they have been there) and you losing access to your fund when you need it most.

You probably have the wrong impression about making profit from bitcoins or other crypto currencies. First of all, its sounds like you think that money just flows into your bank from crypto currencies. Nope, that is not right and this is something you should forget. You will need to bear risks when investing on crypto currencies. Not only investment, but trading also holds huge risks. But trust me, the risks are worth taking.

Just because one thing was better than the other (only few of those) and took over, doesn't mean its going to happen every time.  Taxi still exists and people still use taxis. But before uber came or cellphone came, it took people some time to get used to it. Similarly, people will need sometime to get used to bitcoin and adopt it before they can officially start using it.

Income tax, property tax (millage rate), sales tax and tons of other tax can be easily traced and must actually be reported or else the person can be prosecuted and face huge amount of penalties. Direct taxes can not be imposed on bitcoin, but the government can still tax consumers/producers indirectly. So i don't any issue when people starts using crypto currencies instead of fiat - like i said they will still have to report their taxes. And if someone still talks about tax and government, just hit them with the dead weight loss issue.

Just look at the current circulating supply and the market cap. You will get your answers. Or let me tell it - the chances are extremely low. The based on just the current market supply, the price you are expecting that is $19,000 USD means the market cap being more than a trillion USD which is quite insane for a single crypto to cover. More over it might be possible but the price of bitcoin will be way higher than it is now, so you will be better off investing on bitcoin.

This statement proves how stupid you are. You are just thinking about the short term affect. True you can make huge profit form those scam coins but only on short term. More scam coins will cause more trouble but in "long term". You won't see the affect immediately. Those scam coins will create bad impression on crypto market. Thus it will eventually cause a huge negative impact on the price.

Your title asks one question and then you describe something else (asking about bitcoin). Just in case you didn't know, bitcoin and altcoins are different things. Coins which are not bitcoin, are the altcoins. To answer  to your title that is what are the disadvantages of altcoin, you will need to know how the market works. There are shit tons of altcoins. Most of them are just some exact duplicate of other coins with just a name change. They are mostly the scam coins. These coins just create a bad impression on crypto currencies. People who are new to crypto currencies end up investing on those coins and as a result suffer huge loss. Thus the market it self starts to collaspe.  All they are doing is just crearing oversaturation which can negatively impact the market.
And bitcoin is not being used as a mainstream payment form due to its price fluctuation which makes it quite unreliable to store.

How do you know it has no future? I also don't support ripple since XRP is some kind of centralized shit which quite exactly the total opposite of what we are trying to achieve crypto currencies. But this does not mean that it has no future at all. Maybe people might use XRP and then get to know the real potential of decentralized crypto currrencies. Again people are investing on XRP because of all the attention its getting and they are hoping that the all theses attention might cause price to go up above.

It is quite simple to understand. "Whales" are those who are rich enough to buy anything they want and somewhat famous. They can easiliy influence the public. Anything they say against or for crypto currency causes the price to jump up and down - a form of manipulation. Another form is indirectly purchasing a huge amount of coins in short period of time causing the price to surge up. This price rise makes people "panic buy" more of those coins and in the end the price starts to jump further above. This caused the initial investor (the whale who is manipulating the market) to dump all the coins and max out his profit. Causing the price to drop. Seeing the price drop other users starts to "panic sell" all their coins which further dumps the price. Thats where the whales again step in to repeat the inital process.

After seeing the price rise, people who are expecting the price to reach $20,000 USD over night should not even think about investing on bitcoin as they actually do not know anything about bitcoin and is at the risk of losing everything. To be honest this minor corrections are actually good for the health of bitcoin economy and is quite natural - something that should actually happen instead of constant price rise.

First of all bitcoin is not completely anonymous. It is what we call "pseudonymous". As long as your wallet can not be linked to you, you will be safe. Google that term along with the keyword bitcoin and you will get to know what I mean.
And how is anonymity related to hacking? A random account can be hacked if the "anonymous" user isn't careful enough.

If you are considering the peak price of last year, that is around $20,000 , then we yeah are heading towards a partial recovery. Though a full $20,000 USD recovery kinda seems too optimistic. I am expecting the price to be around $13,000 within a month, based on the current growth rate.