I wrote slot machine software for a couple of years. You COULD put a cheat like that into the code, but you’d have to get the 2 other employees that check you code, and approve it to go along with it. Which could happen, but then you’d ALSO have to pass the gaming control board’s investigations of the code, and maybe GLI (Gaming Labs International).
All of which have seen this type of thing before, and they’d be able to trace it RIGHT back to the author.
“In the early 1990s, Ron Harris was a software engineer writing anti-cheating software for the Nevada Gaming Control Board.
But secretly, he was coding machines with a hidden software switch that paid out huge jackpots when players inserted coins in a certain sequence.
According to CNN, Harris rigged 30 machines before getting accomplices to play the slots and walk away with hundreds of thousands of dollars.
Harris was eventually caught when one of his accomplices was busted trying to rig a game of keno in Atlantic City. Harris pleaded guilty in 1996 to four counts of slot-cheating, according to the Las Vegas Sun, and was sentenced to seven years in prison.”