In bounty It's logical that join the KYC, but not the same for airdrops because of the private personel informations have to be in secure. Lot of scam airdrops in this area, I don't think that it's worth it.
I do not think that giving my documents to unknown people is a good idea, even for a member of the bounty campaign, not to mention airdrops. Here the question is not even in fraud, but in safety. It's just not safe. To track rogues in bounty campaigns, other methods should be used, but not exactly KYC.