^ Why not choose BTC alone?
All you have said above was the usability of BTC and for sure there is more usability that can BTC do but usually, people choose to store value than use it as a currency. In altcoins, they have different functions, you can use them all in one coin only even in ETH.
Sorry but I did not hear any when it comes to payment, only BTC can do and is widely accepted.

^ Good to see if the gambling casino supported these two top cryptocurrencies than supporting only one of them. Both are good and decent, both have a good system that can be used in gambling. But the only thing that I don't like is when your wallet is linked to a gambling casino like dapp which means you trust the casino with your wallet that possible may probably a leak to lead to a hack. Overall, there is nothing to say because they are both useful and both are good cryptos.

^ But I have a strong doubt that BTC will not fall down beyond $15k and will not reach $13k.
Look at the market now, BTC recovered slowly and I think a bull run will come, though it is early to celebrate I have a feeling that it will never go down again. The price of BTC was resisted and it will never fall back again. That is right, it is unpredictable but if you look at and analyze the future price fundamentally, it has a good position that BTC will the price went up.

^ Well probably not all FUD is caused by losers there are instances that it will cause by the whales, sometimes they will spread FUD so that losers will be always a losers. Spreading negative feelings about BTC has been there for how many years and that is why FUD has been discovered which is a short abbreviation of FUD - fear, uncertainty, and doubt. Look at the market now, showing a recovery that will probably lead to a bull market, and for sure those who have been in FUD will regret they were sold their BTC at an early stage during the bear market.
Remember always don't sell at a lower price.

^ Buy low and sell high was still a very effective strategy in trading, this strategy usually uses for those traders who are lack knowledge in trading which is pretty safe but you don't have an exact time to know when you will harvest your profit. During the bear market, you can also buy crypto assets little by little, for example when there is a new bottom price, purchase a little and hold it, time will come those you purchase will become expensive in the market like what happened to BTC.

^ I think the best is a financial position in which is you have a guarantee that the person whom you trust will pay once the money will be lost due to gambling. Even though it is a gambler or not you should not trust anyone else with your money, the temptation of money is quite high because every one of us needs that. So the assurance could be the financial status and the lifestyle he has because everyone has a bright decision we know how to value others' trust not to destroy because once trust has been broken, it will never be healed like as before. 

^ The best advice is should look at first the ToS very carefully before choosing a gambling casino that is VPN friendly because there are many gambling casinos that ban accounts because of VPN and also malicious activity. I don't know how many gambling casinos allow users to gamble using a VPN but I highly recommend always reading the terms before using it. Because for me, using VPN is very risky on our side as a gambler, it could be losing our find and cannot be recovered once we missed what on the ToS important details.

^ But it can be a global alternative currency.
The point was definitely right, BTC was tougher to become a main global currency because of inflation and each country has its own different value of money, and has a different value of stocks so it is impossible there is one global currency.
However, people now think that BTC is an investment, not a currency, everyone keeps BTC to store value not spending it daily the same as fiat currency. So now, how it will become a global currency?

^ On this perception, you are not a gambler, you are a holder because you care about the value of BTC.
A gambler will not care about a value when it will drop or up, if they gamble in crypto after they purchase, they gamble it directly to the gambling casino that they like to gamble there is no loss of the value because you are purchasing at a lower price and in gambling casino if you will bet 1 BTC you will win 1 BTC even if the price has drastically down. Volatility is nothing if you are a gambler, but if you care on it you are a holder.

^ You nailed it the truth.
Op has shown stimulate of dice bot which is dice bot will not work in the long run, probably at that time OP was very lucky and now claiming it here that the bot perfectly works fine. But see, OP did not come back after posting this and probably he/she prob himself that it was a coincidence which the luck was on his side.

^ Really?
I have lost interest in participating in bounty and airdrops because it is totally useless and doe not have to make sense when you get their token but you cannot be sold them in exchange because of a huge gas fee of ETH. Especially in Telegram which I completely hate that social media, full of scammers and you don't know even who are those legit ones. How can you spot a good bounty campaign? or just gamble your effort and time hoping that you will receive a good reward at the end.

^ Go below $10k?
It seems you are wrong here, the market shows recovery and it seems the correction has been over which is I think there is a bull trend will come.
I know the $100k is far far away and that is impossible to happen this year but for me, I disagree with your $10k prediction which is impossible to happen.
Look at the market, the green colors starting to show and I think the bottom price has been already reached.

^ Look at the market now, it shows that the market has been recovered shortly and I think, I smell there is a bull run will come.
One of the biggest problems in the crypto sphere is that there are always called whales which I think is the reason of this massive dump of the market price and now, they are again holding their assets which I doubted that they invested again. So there is no clear prediction of when it will recover and there is also a reason that if the FUD will effect prolonged, that will also have an effect on the market.

^ Yes, where is Electrum wallet that is a very easy and convenient way of using Lightning Network transactions.
I like using Electrum it can be used both on-chain and lightning network transactions. A PC version is always good than the mobile version wallet app but unfortunately, this is not available on Apple's AppStore.

^ What is the difference between BTC and altcoins to use in gambling, altcoins do the same in BTC price, it will follow the BTC trend, when the price is drop all altcoins will follow the trend so I think if you are not a holder there is no matter for you the market price, but if you are a holder, of course, the price or the market condition has a value for you. As we can see, there are too many gamblers recently that still do gambling even though the market has declined too much the price.

^ I have been in compulsive gambler before but I realized that it is not good to chase money on gambling, to spend more time gambling and I now become a conservative gambler who is very strict when it comes to handling funds to gamble, I know how to stop beyond my limit that should not gamble over your limit. In gambling, we should put limit ourselves because it is only we who can control ourselves. For now, I gamble after my whole day's work just to relieve stress and then go to the bed after an hour.

^ The problem would be this.
There are a lot of casinos now switching from non-KYC to implementing KYC casinos. There are a lot of gambling casinos here that switch to a KYC casino.
I think KYC doe not matter to me, as long as the reputation is good I will go for it. I don't usually look at the bonuses and cashback, the reputation is very important because there are some casinos that have a problem when it comes to withdrawal. However, all these scenarios depend on the situation, you can analyze first the casino, and read the ToS and FaQ before putting your money.

^ Definitely right and probably the main problem could be the high gas fee of ETH has remained while BTC you can adjust into a lower fee which is very easy for gamblers to use. I think there is no need to argue with this matter, that is why gambling casinos have multiple coins accepted because gamblers have different preferences in using coins. Only a few of them use smart contract or Dapp gambling casinos which is not very common, so majority of the gamblers choose BTC over ETH, plus factor is very convenient to buy BTC now.

^ A lot of people ask what is the right time to buy and wait for the right time when the price hit the button price, but that is right, BTC price is unpredictable and no one knows when it will dump or pump even. I think BTC will not drop more than $15K and we already hit the button price on it.
It is the right time to buy, I feel there is a bull run that will come in the next few days and the correction has been ended.
Many people did not understand yet how the BTC price will work and most of them still doubted it.

^ This is a case-to-case basis and depends on the financial status of the gambler, but if you don't know him personally or there is no guarantee that he has responsible enough to hold a fund, then, why do you entrust him?
Even do gamblers and non-gamblers are the same, when it comes to money we should be careful who should we trust especially in a business.
Your question is definitely hard to answer because it will matter in the situation, the only thing that I can assure is to know him personally before putting trust because trust cannot be asked, it should be gained.