Once it comes to gambling, you will see a variety of casinos with their ToS which differs from each other, some may ask for the kyc right before the start  while some along the line and some may not even bother you in asking for kyc, if we can check through some of the gambling board and gambling discussion threads here, we will see some of the casinos with their requirements as being announced on their threads, which may ultimately gives further information as it may applies to what we want from choosing a casino.