"GNU" in the GNU/Linux name doesn't nescessarily mean GNU software!
GNU + Linux + X11/Wayland + many other components make up a good, libre OS that puts the user in control. Linux is a cool name but doesn't signify 'freedom' or the original goal behind the hacker ecosystem.
What each word implies
- GNU = Software licensed under a (libre license)
- Linux = The core of the OS (kernel)
- UNIX = Proprietary (non-freedom giving) software
UNIX was a popular proprietary OS back in the day and today it implies proprietary software incarnate in the form of Windows/MacOS or standalone cross device apps/addons.
So what's GNU? - GNU's Not UNIX :P, GNU's not proprietary software.