KYC is know your customer. Careful to share the KYC information.
So if sell the  ICO project token. It need to for the customer information. So that the reason of need for the KYC. But ethereum also need for the token sell. So learn the information before sell. So follow the rules and guidelines. It save you information and no one can get your information. It safe. So share the KYC this information important of all process.