I wonder how this kind of amount is decided, a percentage of the profit they have earn from the decision perhaps ? what is the metrics ? It seems enormous but i

I wonder how this kind of amount is decided, a percentage of the profit they have earn from the decision perhaps ? what is the metrics ? It seems enormous but it's kind of fair when you profit from a monopoly position in an economical infrastructure. I have no idea how this legal stuff work but it sure does seem fascinating.