I don't think KYC for airdrops offered is fair for those who joined. Some ICO with airdropping is not also fine to get KYC for tokens worth almost nothing or a burger meal is not really fine. I observed it in some ICOs with airdrops that even with giveaways like that so small needs KYC? Don't fall for it guys, not worth it.
they do KYC because there are many multiple accounts joining in many airdrops as they said, for me i dont care if they have airdrop and kyc because airdrop is just wasting your time better to do bounties better than airdrop.
But sometimes airdrops gives us huge easy money, we just need to be lucky to chose the right and legit airdrops. Sometimes I do kyc and most of the time I am worried they will just sell my documents.