> provided the drivers exist.

Provided Apple signs 'em :p

Microsoft has implemented driver signing with Windows so not sure what the issue is.

And users can still use unsigned drivers provided they disable the option.

Apple has beef with the worlds largest GPU maker and refuses to sign their drivers because they got screwed by that company over a laptop GPU a decade ago and still hold a grudge.

Microsoft on the other hand, is run by adults.

Where can you get these drivers that exist but just aren't signed?

You can’t because Nvidia gave up and stopped developing drivers for macOS. The OS won’t let you install unsigned drivers.

I know I'm a crazy person, but the idea of having a computer that actually won't let me run whatever I want on it is so nuts.

If that was the only barrier you could sign them yourself. They stopped a long time before that though.

The issue is that Apple explicitly doesn’t want to.

If I understand correctly, accesses to address ranges mapped to the GPU have to be aligned on Apple Silicon due to the PCie controller requiring nGnRE mapping mode for external devices. There's a proof-of-concept AMD GPU driver patch for Linux that kinda makes this work but it's an incredible hack, the performance isn't great and applications still need to be reviewed and patched.