The operator should try to work on the issue of countries' restrictions because at this point that can lead to low traffic to the site and if care is not taken most potential clients will have no choice but to visit other casinos.
There license is what forcing them to restrict other countries, It’s very hard to include restricted country in there casino if the license issuer don’t allow it. What particular country you are referring with this restriction and is these countries is allowed on other casino?
License expansion will cost them additional expenses and maybe they are targeting first selected countries before they expand since they are just a start-up casino but hopefully they will really expand there license for more players to access the casino.