You can bet on NFL games in LV.
The players don’t really have to be in on it; although I suspect most of the elite qbs are. All it takes is a ref to keep a drive going, or end it. For bottom feeding teams, I think they will let them battle it out.
I wondered what Matt Ryan was doing, when he had his team in field goal range, in position to put the game away, and he was still throwing what looked like wild errant passes. Well, penalty . . . out of field goal range, pats get the ball back to score the game tying touchdown.