Basically, if not GNU, Linux would have stayed a hobbyist project or maybe never even happened.
Heck, if Earth didn’t exist, Linux wouldn’t have happened, so Linux/Earth/Sun/Biology/Torvalds/Stallman/SystemD/Mesa/PulseAudio/Wayland…
GNU nowadays is a tiny part of the desktop. There’s also projects slowly moving to rewrite it in Rust and a more permissive license, other parts are losing importance like GCC losing to Clang, so its relevance is dying over time. Just like the FSF.