Parent leans on facts not in evidence. 100 million users of GNU/Linux on the desktop cannot be GNU/Linux freaks/geeks/sociopaths. GNU/Linux works well. If someone with too much cash wants to spend money on CPU power to round the corners on rectangular areas of the screen, so be it. Others want to get on with what they are doing with less regard to M$ and pals bottom lines.
I use GNU/Linux because it works and that other OS does not. That other OS phones home, sniffs files for DRM, BSODs, has a very EXCLUSIVE EULA, invites malware in, needs re-re-reboots, and messes up memory, storage and everything else it touches. I do not give a damn about how beautiful the UI is. I use PCs to get things done.