Downloading an app for money? what they really win

Hello guys i have a question and i need a clear answer :) So as you know many networks CPA, CPI gives you some money (0.40$ 0.50$ ) for every time someones install an app from your content locker. I want to know why they really pay you 0.40$+ for a download, i mean.. how is the profit from their side? if you have let's say 1000 conversions of 0.40$ per install you will make 400$ and they get only 1000 downloads. how they profit from that? they can get access to your phone? Can someone give…

Downloading an app for money? what they really win