It could be a passive income for those who are jobless at this time but certainly not a thing we should have to depend on after all. The risk that we've been in crypto trading is really high, people never know this exactly. Maybe they are of good this time but I'm not sure how it deals when the market dumps ( I was to give-up).
We have to consider crypto now as another source of income but not a thing we think this for a lifetime course. We need to find a secure investment.

First, we should understand that Bitcoin and other payment methods are different. You may not only consider BTC as payment but also as an asset. You may consider that sending BTC needs more times than those payment methods, it may be true. But how is about doing some transaction around the world and need to pay it globally? Sometimes, BTC is needed.
Additionally, people may not only focus on using BTC for payment but prefer to use it for trading and investing. You know, from these, we can earn more profits. It is different from the currency where we cannot make profits from it more easily.

Actually, the fees are different depending on the time we are using and the blocks we are passing. Here, you can set the fees to determine how long your transactions will be processed until done.

Agreed, majority of those new bounty projects are here to cut their own half of the cake, DeFi is making waves and no one wants to be left out, still it's a must for bounty hunters to choose projects wisely, it's not new that most new bounty projects are scam, you have to do your own research on them first before promoting any project.