Having no geographic restrictions is definitely one of the best features of cryptocurrency casinos since almost anyone from any part of the world can utilize the platforms and gamble with ease since there are also no restrictions on cryptocurrency transactions. This has given a platform to everyone to be able to play games without any restrictions.
But, I think there are still some casinos that don't allow some gamblers from some regions to play on their platform, this probably is because they require KYC for withdrawals and they are not able to verify some users based on their region.
Banning some casinos against players from certain countries is possible and also happens for fiat casinos. They don't allow that player, maybe because they can't say clearly in their rules. And players from these countries should be able to understand and not try to play because it will look pointless because casinos can easily block their accounts.
Another advantage of opening an account at a bitcoin sportsbook is that players can use the various coins available in the crypto by buying them in many places. They do not have to use fiat, although that option will remain with their account. Using bitcoin and altcoins for gambling gives gamblers the freedom to choose their coins and doesn't need to do KYC to play at certain casinos.