If I'm not wrong it is not primedice restrict people to access there website but some countries are blocking primedice site so you can't access. Primedice want more people to play there game but because of its popularity some countries are blocking it. If you want than you can use VAN.
ya what you are telling is correct, some countrys restric some sites to be used by their country peoples as they think threat to the people, in arab country you cannot acces some site, if you want you can use vpn service which will give you access to this sites.
same for my country, they already have restriction to some of the gambling sites like bet365 etc. they r now also starting to focus on digital currency too so i think it is just a matter of time. i think their mindset is, if you want to play, you either go to local casino to play. dont play online to leak the currency out.