I believe the croupiers also have rules on how hard they must throw the ball, in addition to rules that define how long they have between picking up the ball and throwing it. In the first case it’s usually at least 3 full rotations, and in the second case it’s before the spot the ball was pick up from passes their hand.

I don’t think a croupier can meaningfully cheat with these rules, especially since they’re not on the hook for people winning too much. If they could cheat I think most would cheat against the casino.