Funnily enough these goalposts were actively moved by Linux proponents themselves. Because whenever there's a criticism of Linux, it turns out that the system in question is not a true Linux... because reasons.
> Linux is obviously and clearly the most popular operating system kernel on the planet.
It is. I don't think anyone is denying that.
> No no, no Android, that doesn't count. Nope, No Chrome OS either, you can't have that, that's, well, that is linux, but its not.
This has been the argument of Linux proponents (many of them) for years.
> Just nice, pure, desktop linux, yes, perfect, arch linux, kde desktop
I've seen multiple claims that Ubuntu is not the true Linux. From people using Arch, or Gentoo, or...