Before someone could proof that this website will NEVER sell or send the personal data to someone else, I will not suggest to do this KYC only for 50 or 25 dollars....
It's only for 2-3 meals but you never know how they could use your KYC..
Just as a reminder to be be careful, but if you are sure this project is safe, you can surely do that.
Well, while I'd fully agree not providing your personal data to every shitty airdrop, blockchain.com
should be quite trustworthy and I doubt they're selling your personal data.
I also participated in the airdrop and if I remember right it was about 25$ worth of XLM + a verified blockchain.com account. However it would be kind of interesting if they're deleting the data after verification or if they're storing it (should be possible to request a deletion as they seem to operate inside the EU).
They give away a huge amount of money, but most of that money will go to cheaters, who use thousands of fake documents to KYC.
Fortunately KYC should block most of this cheating-attempts (exactly that's the reason why so many (airdrops)/bountys require KYC... because of those cheating idiots)