Hi there!

It could happen that you are promoting a scamcoin during a bounty campaign, offcourse if you dont do research on the project before.

Best way to choose your bounty is t9 look for legit bounty hosts here on bitcointalk, and also you could check out alot of legit bounty sites. These sites are hosting numerous bounties and also do the pay outs. Only thing for you to do is to find the bounty campaign you like!

Greetings!