I am playing with primedice and I think they will let you withdraw your prize. As long as you havr deposited to their site, that's a gambling site. And they know that players may possibly win even if it is 10btc. Man, if you won 10btc I admire you a lot. Anyway, support team is just one tap away. You can also message them regarding your concern if they have no limitations on payouts.
We didn't see some legit complaints against Primedice about players not able to withdraw their winnings, so there's nothing to fear here.
If we look at the big wins being posted, that showed the site is a legit one.
Absolutely correct mate,you he can check it thru google if there are existing legit accusations about primedice (and also stake.com)since they are both owned by same person