I got a page not found when using that link without
bitcointalkhttps://p.twicedice.com/

and going well when removing the p. (
https://twicedice.com), you have to investigate it.
and why do we need a full name when withdrawing bitcoin even fiat didn't require it?.
Have a quick look at their bitcoin withdrawals section. 5% fee on BTC withdrawals. They use a 3rd party to exchange BTC to their token. I'm guessing there would be a hidden fee in poor exchange rates both ways.
it could be a problem when swipex isn't supported segwit address also.
If BTC is sent to the wrong external Bitcoin address it will become irretrievable
they must explain the detail because I never heard about that exchange.