No Doubt! I have seen many peope around me who had made huge amount from bounties & airdrop, also some of them might not pay but some bounties like Amepay can give you huge profit, in my opinion if you have spare time then you should do it.
Amepay is a very good quality project. It paid all the payments to the Bounty Hunters. Student coin on the other hand is also a very good quality project but it did not pay the hunters in full. There will be two types of projects, good and bad. Those who have a lot of free time can participate in the bounty. Because bounty is a good way to make money without investing.
Those who care about their reputation are good projects, some just choose to scam bounty hunters despite the fact that they raised a good amount during the ICO or crowd sale, one example is Student coin who has been for so many years in the space, and when they finally reach a decent amount, listed in the good exchange, they just choose not to reward the effort of their advertisers, particularly the bounty hunters. With that action, they already ruin their reputation which is hard to restore anymore.