[Spivak]

If you consistently lose money whenever you transact with someone then you're going to stop doing business with or try to limit how much you lose. They're not rigging the actual game in any way. But if they're not throttling you it's a pretty good indication that you're not coming out ahead.

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.