Take a look at their website and GDC 2019 talks for more info.
I’m not super familiar with Discourse and I’m still figuring out how to use it courteously.
Steam keys actually support Steam’s monopoly—it’s how they get people on the platform. It’s basic free-to-play economy design.
Valve’s statement on the Metro: Exodus page in particular was designed to sic Gamers 
on Epic. And it worked.
Please cite some relevant legislation or case law.
‘As usual’ has always been good for Valve and bad for most everyone else. That’s why the Epic Store is a good thing for the industry.