It is not so mind boggling for me. A lot of people think that airdrops are really interesting and will give serious money and don't think twice when they need to submit their KYC. When I was new, I also needed to learn a lot of stuff but I never submitted KYC for a bounty or airdrop.
Yes some people think airdrop is worth to submit their information for kyc because of the possibility to earn from it, but majority of them are not aware of the risk for doing so. Moreover airdrop is not even a profitable way to earn a decent because it's free, often it's a waste of time since majority are just scam. Anyway, as much as possible it's best to protect your privacy and dont comply to kyc if the platform is not trusted, or even it's trusted always think twice if it is really necessary.
And to be fair, it is a much better thing to ask for something and have some rewards ready for it, instead of just asking for it straight on. It would make sure that people are doing what they want to do and that's how you get good result out of things. I am not saying that it is not okay to ask for KYC, it's distasteful at best, but airdrop for KYC makes sense.
I do agree that airdrops are not a good way of making a good income, but at least we know that it is not that terrible neither, it is a risk people are taking but they could maybe make a profit from it. However, asking KYC without giving anything in return here is definitely a guaranteed zero.