i think you can use water mark when you provide kyc details. then they cannot use those document for another thing. it safer than sending original documents .
KYC is important of the people and useful to some personal using. So don't share the KYC document. It your personal information. So don't share it. You generally don't want to do KYC for not believe the projects. Only do it if you believe the project actually has potential. Some people try to use your KYC document illegal way. So safe to use. So share the KYC if you trust it.