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.
I understand when the KYC procedure is required from investors, but I do not understand when it is required by airdrops. Well, if you at least warn in advance about it, and do not put before the fact.