https://www.pcgamer.com/the-epic-store-wont-accept-crappy-games-says-ceo-tim-sweeney/

For years now, Valve has struggled with the problem of what it should and shouldn't sell on the Steam store. At first, Valve was the gatekeeper. Then it introduced Greenlight, allowing Steam users to vote for games they want to see on Steam. Finally, it did away with all of that, and now allows anyone to put just about any game on Steam if they pay a $100 fee.

That's caused a couple problems for Valve, as the open process has led to Steam listing certain objectionable games that it later removed—despite its hands-off policy, Valve does have limits to what it'll distribute, at least when there's widespread criticism.