This is a straw man, and also not entirely accurate. Darwin is BSD, and in theory just as useful as BSD, or FreeBSD, NetBSD, and useful to developers, and to anyone that can figure out how to install it and use it. [1] Meanwhile, Windows without hardware less than 2 years old is absolutely worthless. Thus, Linux.
If it were not true, Linux would never have become popular. Linux evolved beyond quickly fixing what Microsoft broke to take over the server space, but that was Linux's first practical reason for existing, to mitigate the problems with Windows slowly dying after about 2 years of being installed and used daily.
> Meanwhile, Windows without hardware less than 2 years old is absolutely worthless
This seems like a massive exaggeration. I am currently running Windows 10 on a refurbished laptop I bought in 2012! (So, actual hardware is even older).
[1] http://www.puredarwin.org/