There isn't a conspiracy here. Epic pays developers to make certain games (like Control) temporarily exclusive to EGS. Other developers, like CD Project RED, have not made such a deal, and thus Cyberpunk 2077 is available on many different PC game clients.
There are plenty of games on EGS--large and small--which are not and have never been exclusive. Examples include The Unfinished Swan, SuperHot, and Axiom Verge just to pick three off the top of my head.