You don't think that many people build their own Windows PCs? Linux gaming isn't that old in the grand scheme of things, and there's plenty of people who dual boot for various reasons.
I'd almost be willing to bet that there are more people who've installed Windows on their PC than there are people who've installed Linux from a pure numbers standpoint.
I build my own systems. And I dont know what y'all are smoking but a typical windows installation has the complexity of opening a jar of pickles. Next next yes and away we go.
Linux on the other hand..
Now, if you want to debloat and install without a ms account then yes. But then... Really.... Who does that? (i mean of the typical windows users
That's what I'm saying. Windows installation is idiot-proof. And I'm sure there's enough people who maintain their own systems or at the very least have had to install Windows for one reason or another that to say that "almost no one" who runs Windows installed it themselves is just the "Linux Master Race" talking.
Avoiding MS account and many manual parts of the installation (opting out of shit) is like two clicks in Rufus before installation. Everyone should do it.
Installing endeavourOS was easier than Windows because of all the ads you need to bypass and the telemetry options on Windows. The partitioning options on endeavourOS were easier too plus if necessary one can use a browser. The only difficulty there was on EndeavourOS which the Windows installer didn't have was picking a wm.
That was the most complicated installer I've seen for a Linux distro beside arch32 which doesn't even come with archinstall.
PC building is niche, yes, but do you think "almost no one" builds PCs, like OP said? And that's not even including the people who've had to install Windows on a pre-built system for one reason or another.
My point is that OP sounds like a smug Linux user shitting on people who use Windows. Even 5% of Windows users is too big a group of people to be described as "almost no one" simply because of how big the userbase is. That would be like saying, "Almost no one installs Linux" because Linux only makes up a small portion of the worldwide PC userbase.