Earlier quoted context omitted.
https://blog.greggant.com/posts/2021/10/13/apple-vs-nvidia-w... Nvidia had a knack for putting Apple into difficult situations.
I think Apple is afraid of the AI people switching to CUDA and neglecting Apple's own accelerators. Whatever the case is, it's entirely petty - Nvidia still ships FreeBSD drivers and would probably gladly pick up Apple support again (at least for CUDA drivers). If it was as simple as "Nvidia was an unreliable hardware partner", they wouldn't go out of their way to arbitrarily limit the drivers you can run.
And up until now there hasn't been a Mac Nvidia could even sell graphics cards for.
Even now Mac Pro users will be such a tiny segment it's probably not worth the effort.