Terms are changing from time to time including about KYC related thing.
These days, KYC seems to be something very common in this gambling industry due to license and regulation.
Unlike what we can see several years back when crypto gambling industry is still in the beginning stage as well as on the other crypto industry such as exchanges.
Regarding KYC, always ask the support first so we can be sure about the rule in the casino.
I think we all have noticed that change, years ago being able to gamble without going through any form of KYC was pretty much a given in most casinos, however since then governments have pressured all kind of centralized entities to try to identify their clients, they claims this is done to reduce crimes but we know that what they really want is to identify how big are your holdings, and if they can to tax those holdings and try to get a cut from the money you have been saving in bitcoin for years.