When I worked on iOS games, I ended up having to ban all jailbroken devices. I didn’t like doing it, but basically - every cheater we found was using a jailbroken phone, the number of non cheaters with jailbroken phones was tiny, and it would have basically taken up all my time to deal with cheaters rather than implement fun features. I’d have just ignored them if it wasn’t for the fact that they made the leaderboards look really fake.