Majority of the reason why casino find excuse not to release winner's fund is kyc. If a player has a faulty kyc update or has not been verified, he should be sure that such excuse must come especially when he hit them big. No one wants to part with big amount when you have not done the legal requirements to merit it and so, casinos would make sure they turn your payment down until you have done all verification. It is more taxing to do a kyc when you have won big and casinos that are not quite genuine may rely on the kyc to frustrate you from being paid and you may result to VPN which would make you fall into the trap. Thus, it is better completing kyc before initiating deposit.