Yes, surely all of us already know a lot of airdrops that require KYC and I don't think it's a problem as long as it is safe. indeed a little worried to send our complete data by thinking of using something else, but as long as the project is good it's not a big problem to continue.
But i think KYC in Airdrop is totally waste as they will be giving only 1% of the ICO and for that i think KYC is not requred. this they are asking as to reduce the Airdrop participants to enroll and who ever is giving the KYC document that they can utilize in other way in their project.
The other thing is that airdrop is for tens of thousands of people, bounty hunters only have to compete with hundreds of people and they earn a few tens of dollars. And I do not think they earn more than $ 5 with an airdrop