It is a mod that aims to change the way you get money in the game.

The way it works is that every time you earn some money, a small part of it gets taken away. The more you earn, the higher the percentage that is taken.

So, if you earn a lot of money, a small part of it will be taken away, while the rest of it stays.

This way, high-paying story missions are severely nerfed whilst open world activities as well as low-paying missions are barely touched.