Why Sherbet prohibits so many countries? Many other casinos allow users from most of those countries but I'm amazed to see that Sherbet is prohibiting so many countries users from using the services. I agree with the VPN part as using of VPN is unnecessary on a casino site and most of the casinos don't like VPN users because the VPN users are mostly from restricted countries and they won't be able to complete their KYC as well.
IIRC license scope varies base on the country which the casino is registered for operation. So even 2 casino have same license while they are operating in different country then there’s a chance for a difference on country scope depending on the law of the country they are operating. Some casino use some workarounds with their license to extend their scope to other restricted countries.
I do encounter what @sam experienced on different casino with same license but they later on allow my country to play which means they do something with their license coverage.