Like it was previously said, crypto is one big lottery, so it's almost impossible to become rich quickly without due knowledge and trading experience.

Though it may happen in several cases:
1. If you already had some coins in your wallet that suddenly became extremely valuable (like it was with bitcoin);
2. If you were lucky to guess which of the ~2,000 coins made several X overnight and make a valuable investment.

If you do make a thorough research and analysis of the projects you are going to promote there's little chance to be scammed.
Another problem is that many projects extend their bounty campaigns, reduce the bounty hunters' rewards and do not support their tokens, which eventually cost pennies.
These are not scams in the direct meaning of this word, but they introduce the rules that make the bounty hunters' work harder.

Alts were overestimated during the rush in December 2017 - there were so many promises made by various projects that could never come true.
Since then some projects even launched their main nets - but that brought zero help for their tokens, which are still at least 10 times below the ICO price.
This is not the end of crypto, but definitely some "natural selection" processes are going on that would sanitize the market.

There is no connection with the token being ERC20 or not and if it is a scam. With ERC being only a platform, it is solely your decision whether to invest in a certain project.
I personally would refrain from investing in things like eBTC, since I fully understand that there is no unique idea in it and the real bitcoin is more trustworthy and reliable.

You mentioned blockchain as a backup for transparent payments, but it could also be used for things like storage of data, which could not be intentionally changed.
One of the examples is implementing blockhain-based system of elections. Imagine there is an open system that prevents cheating with your vote - I think this could be especially demanded in the countries with high level of corruption.

I would recommend staying away from crypto market - the bull run that we've seen in late 2017 is unlikely to happen in the nearest future.
Look what happened to Ethereum - it used to be one of the most promising coins, and where is it now? - almost below $200.
Btc could be a safe way to store your money, but I'm not sure it will once again hit $20k  - most probably it will oscillate around $6,500 for the next few months.

Demand breeds supply, so obviously there will be more both online and offline stores accepting cryptos if the developers see that it is demanded by the customers.
The main problem is the volatility of bitcoin, so many people would prefer keeping their btc in their wallets as an investment that could cost several times more.
If bitcoin becomes a more stable, buyers would not be afraid of spending it on goods and services.

Using digital currencies requires a well-developed and stable Internet infrastructure and basic computer literacy of the population.
No offense, but I don't think that both these preconditions are fully met in Africa.
Instead of introducing cryptocurrencies there I would rather encourage African governments to spend money and efforts on combating hunger, shortage of water and electricity and building normal homes and roads.

If you mean mining infrastructure, China has already become the world's leader in the number and hash power of local mining conglomerates.
If talking about the widespread use of crypto, I bet on the US. Even though there are new restrictions being adopted to trading and investing in crypto, the US legal system is more loyal to crypto encouraging the citizens to utilize digital coins in their everyday life.

Gold is closely connected to inflation of fiat currencies such as US dollar and euro. Yes, its price doubled in mid 2000s, but the value of dollar also fell 40%.
Precious metals were considered to be a "safe haven" during the financial crisis in 2008 and many people invested in gold and silver in order to protect their funds from devaluation.
On the whole, I think investing in precious metals can be as risky as investing in crypto, so I prefer keeping my money in a reliable bank and get that stable yearly profit.

Why don't you try both? By the time the bounty is over and you get the reward you will already have the idea of what trading is and how to sell your tokens.
Enter a bounty campaign and in parallel try to do daily trading with, say, $100. If you think that you are doing everything right and actually making profit, invest the remaining $300.
I hope this strategy will help you not to lose money  

Good concept and potential have cease to be key factors of success. The main point now which is taken into account by investors is whether the projects will be able to support its token by implementing a good marketing strategy and listing the token on most popular exchanges. Moreover, many investors have lost a great part of their portfolio value over the past 6-8 months, so everybody now is extremely careful when choosing a project to invest into.

ICOs are alive, but projects are making a lot more of preparatory work if compared with ICOs held in the first half of this year.
One of the indicators is that bounties are being extended for several more weeks - it means that projects make a more thorough advertising campaign.

As a speculative asset bitcoin can improve the financial state of people, provided that they make a nice monthly profit by byuing btc at a low price and selling it at high price.
Consequently, the consumption level of the population goes up resulting in the increased GDP (which as we know is the final value of all goods and services in the country).
I am not sure if bitcoin can improve the economy if it is utilized solely as a means of payment, but the freedom of using crypto is definitely one of the indicators of economic "health" of a country.

If talking about the Venezuelans, several dollars per day could be a true remedy for those poor people who are forced to suffer from the foolish economic policy of Maduro.
But in well-developed countries people have to earn massively more per month in order to pay their bills and bank loans. In this case bitcoin could rapidly change one's financial situation in case he bought some btc for $200 in 2016 and sold them for $20k in late 2017. Regrettably, not everybody had those several thousand dollars to invest in btc when it was in its lows.

I think the value of btc will decrease, because a global natural disaster will result in the deterioration of infrastructure.
Problems with electricity and the internet will prevent effective use of all digital services.
Fiats and other means of exchange like precious metals, weapons and food will again be the most valued "money" in this post-catastrophe world.

Bounty hunting can be profitable only if you have a bitcointalk.org account of not less than Full Member and a Facebook/Twitter acc with several hundred friends or followers (it is preferrable to have all of them).
One can also do translation bounties, but these are risky since the translators are frequently scammed by unscrupulous projects.

At the same time, trading requires some initial capital to be invested and a lot of nerves/time to follow the fluctuations of the market.

I personally chose bounty hunting because trading on crypto market is too much exausting for one having a stable full-time job.

Crypto will not replace the usual economy for at least nearest 50 years - its infrastructure is not yet so well-developed and there are unresolvable problems with regulation of crypto, especially in the Asian countries.
The way I see it is that blockchain will be gradually adopted by the "first world" countries with other states looking at their experience and learning from their mistakes. It is natural - somebody has to be the pathbreaker making headway for others.

This year was definitely very bad for ICOs, even though their number grew almost exponentially.
Most hyped projects indeed managed to reach their hard caps, but due to the crash of Ethereum in mid-summer their tokens are worth several times below the ICO price. Investors are desperate, some of them are selling their portfolio and getting out of crypto, resulting in prolonged stagnation of the market.
I don't have any good reason to believe that the situation will change by the end of this year - something extremely unusual should happen for the market to recover.

Yeah, translation is the most sensitive part of any bounty campaign, since it needs more time to be evaluated.
If I were you, I would try to figure out whether my translation was actually used in their WP and ANN thread, and if it was - report to the forum admins and ask them to ban the initiator of the campaign and all the topics that the corresponding account started. I think this could a nice lesson for project teams not to scam those who diligently work for them.