honestly i would anticipate a lot of weapon bans that hurt the game's pace or is otherwise problematic, overpowered or not.
for example, in tf2, the mad milk is an item you throw at the opposing team to gain health back upon dealing damage. it's not actually very overpowered, it's just that it slows down the game by a lot because the scout has a safe option for healing and places less emphasis on the medic
i would expect bans like that for splatoon, so that only weapons that have a healthy dynamic for the game are allowed