The fact that they limit the accounts of successful bettors doesn't mean that it is "rigged". It simply means that they reserve the right to do business with whom they choose.
If there was an obscure way to play craps that made the house advantage negative they would either change the rules or ban the practice. You could call it rigging but by that token every game is rigged, that's the whole point, you're playing in the hope of beating the odds. The rules and odds are completely transparent, 'rigging' would be like using weighted dice.