The same way in airdrop and bounty are both profitable and can be used for the earnings, in airdrop you are just waiting for the platform that they will give you some money by just inviting friends, subscribe to their channels and more rules and some of them are just scam just to gain a lot of people support with their project, the same with the bounties there are a lot of rules and instruction you need to do before you joined to their projects and after you already work, some of them does not pay you that cause loss of time only. Always be aware of the bounty and airdrop are real and stop wasting your time always make a research first before joining.