Thanks for the clarification. Unfortunately, there is nothing we can do about and we can not even know if the casino is asking for kyc for actual security reasons or just to scam. You will have to trust them.
sad but reality , tis is why depositing in Online gambling site is risky and we must dig deeper before putting any single cent from this.
This is why I personally prefer when the casino impose kyc from the beginning when you create an account or before you make your first deposit rather than to wait till you make a big win or they suspect your activity.
When you register on a licensed casino, you should be prepared to get asked to submit your documents at any moment.
The lower the risk yes but assurance ? yeah there is a little chance but it is much better than those not asking KYC from beginning but then will seek one after you won or need to withdraw.
there are names here in forum that has hundreds of these complains though it is not good to mention here.