It depends upon the bounty as well as the participants. There are bounties that has small allocation in every campaigns but has less number of participants so in that case it is OK. While some bounties have high allocation but too many participants so for example you can only get $20 per week. On the other hand, not all campaigns are legit. Even these times, scams are still everywhere.
Airdrop ? I am not a fan of airdrop right now.