In most states the regulations covering slot machines explicitly cover error. one of the most interesting parts is I can't find any part of the wagering regulations that cover error here. It's entirely possible they should but as far as I could tell they currently do not

Setting the odds incorrectly isn't considered to be an "error".

If your slot machine is supposed to pay out 1000:1 and you set it for 1:1000, sucks to be you, but it isn't an "error".

Actually: I apparently stand corrected. The situation generally gets investigated by the state board who works out the appropriate remedy.

Slot machines go through an absolutely grueling certification process. Interesting to see if FanDuel is willing to subject their software to it.