Metro: Exodus managed to put up some impressive sales numbers despite the widespread backlash against Deep Silver's decision to move Metro: Exodus from Steam to the Epic Games Store and cries of "no steam, no sale". The game sold 2.5 times as much as its predecessor, Metro: Last Light did on Steam. As a test case it's good news for Epic and the developers itching to move off of Steam. So not only did Metro: Exodus make more money selling on Epic, Deep Silver got to keep a significantly larger chunk of that money. If you want to know why developers are interested in the Epic Games Store, that's why.
Source: Forbes March 20, 2019 18:22 UTC