Which makes it now a legal currency in most countries, which means it could be used to go into a legal agreement that will be bind by law, so unless the casino is not ready to operate under any government and serve the citizens of a particular country, then they will need some licence to operate.
For the main time, if you are starting small as a casino, you might not all need those licences and approvals as there might be little eyes on you, but after that, if you want your business to go far, you need to operate based on the laws that govern owning a casino.
Registration, licencing and regulation are important and I will always support it. We should even thank the countries' governments that are still allowing cryptocurrency in their domain, if they don't, there is nothing anyone can do. Also, for the reason why some countries ban cryptocurrency, well, it is obvious and it is to encourage illicit financial flows since the government cannot oversee it. Even the illicit flows will be meant for so many illegal activities that could be so devastating to the country. But some governments are only protecting their economy, crypto is also a devil in disguise as your country's money might not be recorded for the country but stay in crypto (cross-border payments), how can it add FX to your nation even if it is gotten from another country? The government will never know of such a transaction unless you call their attention to it. Nevertheless, the government that banned crypto went too far, they should have regulated it just like the US and the Western nations are doing. This would have served the same purpose or almost the same purpose as the banning but with the government gaining more from it. This is even as the supposed banning is not always effective as people use other means to move cryptos behind the back of the government.