Only few ico are requiring Kyc and sometimes we do nothing but to follow what rules they have if the has a potentials to increase its value. But airdrop requiring kyc is just a bull shit rule with a small amount of money you could get from it they will ask your personal documents, was actually an insane rules.
I would always avoid taking part in ICOs projects that requires me to submit my personal identity documents to their developer team, I believe it is a very risky action to submit your personal identity documents to a group of people with unknown intentions on what they are going to do with your documents, and I don't think they would have a complete security system to safeguard all those important information of every participants from the hackers.