Crutch

Crutch is a something which is stronger than most other strategies/methods and it hinders with people against it

due to it being so strong and having abilities which players get used to, it hinders a player in the long run

For example, the dead ringer in TF2 made players behave badly as they basically went on suicide missions and just annoyed players, after a while of playing like that, they stopped having any games sense and were playing horribly with literally anything else which was not their crutch weapon