Crypto gambling needs freedom, and i insist in this point. If you can Deposit, Wager and Widrawal, then you don't need anything else. And a big shout out to those casinos who still working until now without a license, freebitco.in, Just-Dice.com, bustabit.com... They are big examples of how crypto gambling should be.
I know for sure that in US, if you must operate as a money operator then you must be dully registered. This is why casinos must recognize of their activities if they want to operate along with the US citizens because it's involve deposit, withdrawals and gambling with it. This law is what protect other countries too that you must be fully recognized by them but I think is because of tax, they want to Tax these casino badly that's why they want to have license before they are allow.
These casino sometimes include Bitcoin and crypto among their deposit because they want to compete with others, they don't want to do only fiat not to be rule out of the market, it's when they compete some ot them run into problems and we know the government hasn't be friendly with crypto, it will be a total waste of time.