Just a side note I wouldn’t necessarily put Witcher 1 on the same pedestal as witcher 2 and 3. You could enjoy it, thematically and story wise it’s spot on Witcher, but it’s pretty klunky mechanically speaking and really shows its age. 2 and 3 are Fantastic in every way though. I hear they’re potentially remaking 1 and I’m all for it if it’s in a style similar to 2 or 3.
I think the difference here is that Valve isn’t forcing a monopoly in the way our tech overlords like Google and Amazon do through acquisitions and regulatory capture.
Several companies have tried and mostly failed to compete with Steam, I’m primarily thinking of whatever the EA and Ubisoft launchers are. The two closest have been GOG whom I would argue is fairly successful considering what their goals are and Epic, whom I would say is much less so.