Mine would be arbitrarily slowing down a character to maintain horror in a game. I get if there are reasons like age, injury, or location that could provide context, but don't turn my legs into molasses because you need to time the jump scare just right.
Events based on real time. Time of day, seasonal, what have you. Outside of games where that's the whole point, it's just an artificial hurdle at best and abused for FOMO shit at worst.
ESO is pretty good about that in that they repeat the same prizes every year.
I loathe games where you can only get some item once, and the game is 10+ years old.