I don't think this is a given. I think most gamers so far haven't cared about openness because pragmatically, it didn't matter for them.
Now they're seeing the long-term effect of not caring about that though, which is why we're suddenly seeing a movement of gamers moving to Linux, and trying to get others to move with them, because they realize the importance now, as their desktops are slowly collapsing over Microsoft's decision to let AI do all the programming, and having zero QA before releasing stuff to the public.