I think it is very risky and not so wise to give out your details of kyc anyhow because the rate at which cyber crimes are aggravating is too much. We all need to be security conscious.
Of course it is risky, they can easily use your documents to scam others or use it in to fraud. That's why you need to be careful when we are giving out our IDs/passport and etc. We are in online world which anything is possible.