KYC is recommended in almost every casino. Some casino sites it is done before betting and on some sites it can be done without kyc. But I think it is better for the gambler to complete KYC to conduct smooth betting. If KYC is not a problem for a gambler who bets small amounts, KYC should be done for big gamblers who gamble a lot otherwise there may be problem. If KYC is shared in terms and conditions then it must be completed prior to gambling. Many people neglect this, but if you get a big win, there may be a problem with the money of that win. So it is better to do KYC to avoid such problems.