If any other country does not follow bitcoin which I know its impossible, those two countries are definitely keen on finding out what will happen or happening in the crypto world with bitcoin taking the lead role and that is why some exchange sites and gambling sites specifically banned users from these two countries from patronising their services.
I do not think that is the reason why users from this country were banned from some exchange sites and gambling sites. The reason I think is with connection to the country rules and regulation regarding these kinds of exchange sites and gambling sites. The law of those country probably prohibit anykind of gambling that is not registered in their regulatory board or gambling is not allowed in that country. Aside from that I do not see a country wanting to be the leading role with Bitcoin as a reason to ban its citizen in some sites.