Ofc, thats a self-fulfilling prophecy: nvidia should never see high usage in linux if they’re not spending money there, except by accident (ie a cheap, good card also happens to be cracked open enough for good open source drivers to be written, or something like bitcoin crops up again, and linux/nvidia is necessary enough that people use it despite the shoddy drivers).

But it always has to be because the lack of interest by nvidia was overcome

Although it doesn’t matter to gamers buying GPUs solely for gaming, it really matters for a lot of the researchers (not just computer science, but any major that uses GPU computing), and also the professionals (using CAD and other software). They are also buying those high-end GPUs alongside the gamers, and are constantly irritated by shaky Linux nvidia drivers. If AMD gets enough support for high-performance computing (ex. deep learning), then researchers might be more inclined to switch to AMD...

What I don't understand is how come driver for their cards works just fine on Windows AND MacOS then? Maybe it isn't Nvidia at fault alone here?

TBH, I only had problems installing their drivers on Linux, but once they were up and running all was/is good... Except Wayland. But, wayland's gonna way no matter what, so no Wayland for me.

Doesn't apple handle the creation of most of the MacOS drivers itself? I'd assume its the case for graphics cards as well.

Windows ofc is windows, it justifies itself

Nvidia provides their own drivers on their site for MacOS - you need those for newer cards.