One of the oldest and most popular Crypto currency casinos, namely Freebitco.in are not licensed and they also do not require KYC details. What does that tell you about the "needs" of the "clients" in this industry?
Gambling licenses don't appear to offer much benefits other than to ensure that behind every platform is a legitimate company that has all the necessary legal rights and responsibilities.
Freebitco.in is in a completely different ballpark. They have a long history and reputation in the community, so the license does not mean anything in their case, unlike many new gambling platforms that have sprung up without being vetted by the Bitcoin community.