Your argument is illogical. If devs don’t want to support it, they simply will not support it—as evidenced by the thousands of games that have yet to be SteamOS verified, but either run just fine, or don’t run at all with the devs not giving it a second thought.
Besides, if this does end up putting pressure on the developers to start supporting more platforms than just Microsoft’s data collector ahem I mean, Windows, then I’m all up for it. It’s a win for everyone.
I never said they were forced to support, but that they are forced to fund such a thing for their game as opposed to their being an option for Valve to fund it.
It's way harder to support Linux than Windows from a developer's perspective. Proprietary vs. open source drivers, approach to driver updates (rolling release vs. stable distros), 5 trillion incompatible glibc versions, X11 vs. Wayland etc, janky sound systems with varied support across Linux distributions (Pulse, Alsa, PipeWire), no ABI compatibility guarantee etc.