Wow, that's amazing! I assume this doesn't really count Steam Deck because usually these stats are from website hits and whatnot.
I remember when we were floundering around 0.50-0.75% or so and 1% seemed unlikely. And now we're where macOS was some time ago. That's pretty awesome!
If this is from website hits, then people like me are going to be unintentionally skewing things in Windows's favor, as my browser always fingerprints as running on Windows.
Yup, and I'm guessing part of what's causing the shift is people no longer needing to do that. Netflix has worked on Linux for years, and very few sites actually care about OS anymore, though many do care about browser (e.g. I often get stupid warnings on Firefox despite sites working fine).