I think in this 2022 bounty hunting is best idea for earning money without investment. Because as we know that now almost IDO are being failed. And ICO, private sales are now very risky they also are being totally failed. You can go with staking, NFT or bounty.
I will prefer you bounty, you can check bounty page there are now a lot of great bounties these are of large pools and many of them are escrowed by bounty manger, so there is less risk of scam.
It is such a small line between a good earning and a bad earning that people really do not know that thin line. If you know what you are doing and making a good return then you should be fine, however if you do not know what you are doing then there is a chance that you could end up losing all of your hard work for nothing.
Bounty is awesome, but it requires you to work, plus you can't just work on just one bounty and then claim done, you have to work on multiple ones and you need to work on at least one every single day, multiple if you could. This is why you are working hard and that means you should be able to actually getting paid, hence finding legit places is the hardest and the most important thing.