Couldn't Nvidia add the same clause to their product's license (instead of the driver's one) and thus having it enforceable even if you use some 3rd party drivers?
What product license? As the producer of some physical item, you don't get a say in what I can do with it after I bought it. Especially not if I never did any deal with you in the first place, but bought the thing through a long distribution chain of middlemen.
It's only with software that people consider it acceptable for the vendor to tell you what you can and can't do.
This will also not be enforceable in all countries. It is probably not enforceable at sea where maritime law rules.