Rat's Law

If the game allows ratting, there will be ratting.

Player: Jesus man, why do people rat at the extract
Other player: That is Rat's Law for you
Player: I am going to go complain about this issue on the Discord server
Other player: Don't, just deal with it
Player: Ok

Ratting

This refers to when a person in a video game applies techniques of keeping them hidden and using their abilities to catch a person by surprise. It is mostly associated with those who extract camp and camp in corners to surprise players and kill players.

Timmy: Man, I just died to a dude ratting in the corner
Chad: Let me use a grenade to force him out
The Rat dies due to a lack of skill