On EVERY slot machine somewhere it says “Malfunction voids play and pay”. Indian reservation or Vegas strip.
I know that. But what are the odds a machine “malfunctions” right when a player wins?
There’s news stories of how people won at Indian casinos only to be told this and the Casino weasels out of paying by paying for a meal or free night stay or something. And because it’s on reservations, there’s no legal recourse.
Which is why I play slots at the bars, and not the casino.