Casinos with ridiculous terms (like mBitCasino) are always happy to allow players to break their rules on multi-accounting, assuming the player loses.. Player wins they just close account saying you broke their terms. The fact they only bothered to trigger a lock on your account until after you win is all you need to know here.
There are a plethora of good sites out there, that not only don't have questionable T&C's, but also provide provably fair games with much lower house edges than sites like mBit, Betcoin etc.