They should be more scared... Mac, ChromeOS and Linux now have roughly 1/3 of desktop/laptop users. Linux having gained a lot of ground just this past year, and IMO Valve is probably solely responsible for most of that.
Even with the Valve store cut as high as it is, and some of their sketchy terms... they've been far better stewards to gaming than MS has been to Computing/OS.
Even with the Valve store cut as high as it is, and some of their sketchy terms... they've been far better stewards to gaming than MS has been to Computing/OS.