Is it possible that the casino management courses may be allowed to be studied and taught in countries or regions where gambling activities and casino businesses are banned?
Are you in a country that prohibits gambling? If so, you should also be able to find out whether the course for that major is available in your country or not. Because there is a big possibility that where your country prohibits gambling, then the course for that major will not be available there.
I am sure it will be difficult for institutions that provide courses for that major to get permission.