Valve did so because they had steam money to rely on, they were boiling the frog slowly.
Notice what they did to TF2 and now the are making artifact (totally microtransaction based game).
Notice how all that money from Dota 2 and TF2 were the end game, you don't get that STEAM malware client, was for valve to ultimately to get to in game stores. Valve was very careful in how they manipulated you into not owning your ow games so they could shove in game stores and mtx into them.
For other games like battlefield or modern warfare, and even overwatch... the problem remains that they can shut down the game remotely, aka Overwatch is not coded in an honest way where you own the game outright, you can't use its multiplayer as a stand alone app, aka you're using stolen software that is coded in a criminally screwed up way so that Activision maintains control.
The whole goal for the game industry was in game stores and mtx in every game and to do that they need to undermine game ownership.
Fortnite, Dota 2, and league of legends would have been fully boxed product games with LAN multiplayer/dedicated servers in a past era, aka for most AAA games we no longer get server exe's and get matchamking.
Quake champions is literally a stolen quake game where you don't get to own it, quake fans wanted a quake they owned and controlled like the first 4 quakes, with QeRadiant, dedicated servers, etc.
Quake champions can only exist in a world where companies have won and games are being coded in criminally underhanded ways to deny local application game files.