Before submit your KYC must know about their background. Some website we can trust like bittrex.
can you trust bittrex? do you know who their 3rd party KYC service is? do you know what jurisdiction they fall under, and whether they are obeying all data protection laws in your country of residence? many exchanges and bitcoin services have had their databases hacked, along with customer ID info. that stuff ends up on the darknet, sold to criminals.
But it doesn't mean we should trust all over ICO. Can some one explain why it is necessary to submit KYC for airdrop or get bounty stake? I don't think so it's necesarry. All crypto transactions are anonymous. So why I need to verify KYC.
it shouldn't ever be necessary to submit KYC for airdrops or bounty stakes because the amounts are way too low qualify for reporting under money transmission laws.
some ICOs do it because they are misinformed about the law. some do it because they think it will make them appear legit. some do it because they want a way to avoid paying some of their bounty hunters after the fact. some do it because they are going to sell your documents on the darknet.
none of these reasons are legit. don't do KYC for airdrops or bounties!