It's not really hypocritical but may seem contradictory. Primedice are likely just trying to comply with US gambling laws but you can always get around restrictions by using a proxy or tor which I suggest you do if you want to play.
How far can Tor get you through this?
What happens when you get caught? Will the US gambling laws get you end up in jail?
Tor can protect you pretty damn well and so can using bitcoin if you use it right. Tor (and bitcoin) seems to be working fine for 99% of darkweb customers, but generally US gambling laws don't end with the users going to prison but the casino operators might if they've found to be breaking the law.