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 absolutely agree - going through KYC process means that you have certain obligations for the project team, but in case of an airdrop it is absolutely unnecessary.
Moreover, I think that projects which require KYC are just making a database of potential investors and further sell it. As a result, your mail is overwhelmed with the ads about upcoming ICOs, new exchanges and other announcements. It is really not worth it to sell your personal data for like 10-20 bucks.