Restrictions on Pakistani bookmakers

Hey guys, I can't figure out why some bookmaking platforms don't accept players from certain countries. They're supposed to be online services, so why are they so strict with their filtering? Do Pakistani bookmakers have similar restrictions, or is this more of an issue for international sites? I'd love to hear from anyone who's experienced being blocked or unable to create an account. How did you resolve the issue if the service was unavailable in your country?