Valve has the games and tried to build their own console and failed. Google has now effectively built their own console and doesn't have the games.

Valve only came up with Steam Boxes (and it's whole Linux push for that matter) as a defensive response to the Windows Store and the, at the time very real-seeming, possibility that Windows would become an entirely walled-garden they'd be beholden to. They put much effort into Steam Boxes, they were just a PC with Valve's Ubuntu derivative distro. Fortunately for Linux users though they did continue to put a lot of effort into making Linux gaming actually viable, thus insuring that they'll always have an out if Microsoft goes stupid.

yeah, valve has its own ecosystem it wants to lock people into