Win 10 IOT Enterprise LTSC will be my last Windows. I'm fairly sure Linux will be significantly greater in 2032, so I can avoid this spyware trash. Unfortunately my area of expertise is C#/.NET, so I'm stuck with this trash at work when I will be a working citizen.
In personal experience there has been a big rise of Linux on the server and more people being forced to get used to it. Docker is pushing this along even more now. We are seeing the continued rise in osx and improvements in the Linux desktop. Moving away from windows is becoming more acceptable now, even in corporations. This will continue!
It doesn't say how they measure it. Some browsers identify as using Windows. Many people also use multiboot with Windows. Having Windows preinstalled also doesn't mean you're using it.
Pace of adoption also seems to be accelerating , from 2009 to about 2016 it went from 0.5 to 1,5 (+ 1 percent), from 2016 to 2023 it went from 1.5 to 3 (+1.5 percent), the adoption also seems to be at least doubling about every decade (which might indicate a "word to mouth" growth pattern.