Each casino operates in the jurisdiction of a particular state. It determines the legality of being on the site gamblers from different countries. Such lists are given in the rules of the casino. When choosing a site, make sure that the institution accepts players from the country where the user resides. You can ask this question to technical support and make sure that subsequently no problems with verification and withdrawal. I recommend to read https://coinplay.com/slots.
The rules contain a lot of useful information. They must be read. It is better to spend time on the fine print than face unpleasant surprises later.