Technically, if you've got the know-how, you could code your own graphics acceleration drivers for nVidia cards on MacOS, it'd just be extremely hard and expensive to do so.
You’d run into the same obstacle NVIDIA has, namely that Apple won’t sign your driver so it won’t run.
NVIDIA isn’t morally opposed to Apple, it’s largely Apple that’s opposed to NVIDIA, for reasons like the cuda ecosystem and how it locks you into something that’s not an Apple product and how that would affect Apple’s leverage in future negotiations. Apple wears the pants, not their suppliers.
