KYC is the problem, a lot can be known from the KYC document a user submitted, but it may also be other things like having multiple accounts. In this case, it is KYC that would tesulted to this. Gambling sites that require KYC makes it easy fir people to register on their site, deposit and bet, but if the user win and want to withdraw, that is where the problem is, the gambling site will look for lapses of the user and look for other means to be a good reason not to be able to withdraw, like having multiple accounts or using fake KYC.
Yes, but why blocking the account? Which users cannot login. If KYC is the main reason then tell the user that there is a problem to the documents he uploaded so he can upload again.
Isn't asking KYC is to make users provide their details and identity? What's the chance of making a user as multiple accounting after submitting KYC? By just seeing the names? There are billions of people, having the same name is not impossible, but the address, face can be different.
Casino nowadays will just hostage your account's balance, banned you after you provide what they ask without telling you the reasons for days, weeks worst for months or not at all.
Or just making excuses since it's their forte.