They are artificially manipulating the market. That's about as textbook rigging as putting three masts on a ship.

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.

Limiting those who stand a chance of pulling off the type of big wins they advertise heavily on television is rigging the market. It's manipulation, pure and simple. What they're selling is a bullshit dream that if you ever come close to they will bar you. This type of activity is the definition of predatory. It's straight up rigging.

It’s not rigging. If you place a bet and it wins, they will pay you. It would only be rigged if a bookmaker decided whether or not to take your bet after the event.