Or are they mostly shitcoins, disappear or using your emails for phishing?
Have you ever participate to one with high profit? How long was wait for that?
I think most of them are just bullshit and time wasting and not worth putting some effort in.
There are great and legit projects out there that are giving token airdrops or having a bounty, because that is probably a best way to get more people to participate and engage with project activity. There aren't really alot marketing options for crypto related projects still, so airdrop and bounty is a great way for project to increase its community number and try to engage people as much as possible. I did participated in few that really paid alot, and I'm still holding those tokens because I do believe in the future of those projects.