Cryptocurrency restrictions in some countries have influence the restrictions of some cryptocurrency Casino and when it comes to that, the main reason why I don't blame the casino for restricting some countries is because most at times, the restriction is from the country government who refuses to offer the casino access to their cyber space and for not to waste too much of potential client time, the casino will list such a country on the list of restricted countries on the website, so is not as if those cryptocurrency Casino just want to ban those countries and infact sometimes the casino take extra step to try and see how the ban could be removed and if there is positive response from the regulators the unban such a country.
But when the collaboration is not productive, that when you see that the list keep being same without any possible correction removal or any form of input from the team, so for sure if monkyTilt.com continue with the same pursuit in the time to come, the numbers of restricted countries will reduce.
Even though you are right, when a country has banned cryptocurrencies, it would probably also not allow services offering cryptocurrency usage as well such as exchanges or casino platforms, such countries will probably stay in the list of restricted countries until the government changes its stance. However, if a casino has countries where neither cryptocurrencies nor gambling are illegal in its list of restricted countries, it's mostly because of licensing.
A casino might start its services by acquiring licensing to operate within certain jurisdictions first, and then it starts approaching other licensing authorities to acquire more licenses so that it can offer its services in other regions as well, which is probably what MonkeyTilt is working on right now since they are adding a lot of countries in the list of countries that are allowed to use the platform with the upcoming update.