I can still play Quake without Id spending any of their own money running servers.

That's literally all anyone wants

Community run servers were killed because there's a possibility the community run servers would let you play with content you (gasp!) didn't pay for, as happened with TF2, so they can't possibly let you have that option! If they don't get $6 for a texture file, the world will end!

And don't give me bullshit about "But they would have to put extra effort into building that", as if nearly every game server application provided to players has ever been anything other than a random exe file with no documentation and critical flaws that require third party hacks to fix. Pretty much anything built on Unreal or the Source game engine had a ready to go server by default, or with a checkbox.

Hell, even nothing more than a carveout in the DMCA to allow people to legally reimplement servers after shutdown would buy a lot of goodwill. This carveout is only needed because the DMCA dramatically limited your legal rights in respect to software products just a couple decades ago.