This is just yet another example that you may think things in the hardware world have changed now that Linux "rules", but they have not.
On the other hand here we have a random guy that adds support for nvidia gpus, by himself, on a non-linux, non-bsd kernel. And specifically claims he will not do the radeon one because he finds it too much work.
Given how performance-sensitive device like a graphics card is, you’d naturally want as few abstractions between your OS and your hardware as possible.
On the other hand here we have evidence of how this has made it impossible for any OS other than Linux to provide support for amdgpu (except if you rip a huge chunk of Linux code, which only works if your OS is extremely UNIX-like to begin with), while other OSes support NVidia cards just fine (which do not really have a complete free driver to begin with!).
No evidence that a Linux driver targets Linux? Isn’t that what you’re moan about?