But if still want to access these sites where these sites are blocked can access by using a proxy or vpn. I think still many people may be gambling from these two countries even though it is banned. Primedice is one of best dice site but they need to add many other games if you want them to call it as a casino.
You gotta realize that using a VPN to access and gamble with is very different than using VPN to access porn behind some university hub.
If you want a good example, look at what Bitfinex is doing to people who are caught accessing their Bitfinex account pretending to be non-USA.
They are getting their accounts frozen and support is not replying. And in that scenario its very risky and might lead to loss of funds.