KYC alone is already a bad idea, IMO. Sending your sensitive information to them which might be used against you as your ID contains vital information that would help them hack your account. Rumors has it too that the information you send to them will be sold in the darkweb and they will earn money from your data.
Nah
I know a lot of people will be against the idea of having KYC for ICOs, so am I, but they are important for ICOs and I read that the US SEC is preparing to prosecute ICOs that are being held without KYC. Things can have advantage but there will also be disadvantages, cause some stupid will always try to find a way of misusing that good thing. Ive also come to know that it is fake ICOs that dont require KYC. Majority of the legit ICOs require KYC for it.