Have several gambling site restricted from my country and usually as active on Stake gambling platform, depending with your country rule because all majority will not allowed or restricted with gambling site platform. Have looking with trusted gambling platform site as allowed with your IP address without have helped by using VPN, will got bad thing later if try keep access with gambling platform site by using VPN and have potential with your account suspended because break out from term of service from gambling rule.
There are those casinos that are really restricting users if they're found in those countries that they're not supporting. OP isn't on that condition I guess but rather there's a problem upon his access to gamdom.
It's working on my end and OP has to try it again if it's still not working, he has to check his ISP and everything related to his internet connection. But if still no issue found there, he can contact gamdom and address his issue that he's not able to load the website.