I'm curious how effective something like that would really be.

Nvidia can certainly put up some guardrails that will sound impressive to the dinosaurs in Congress, but can it really stop China from using those GPUs anyway?

This is a simplification, but is this not in some way similar to how the Switch 1 has hacked due to a design flaw on Nvidia's Tegra chip?

In the same way, even if their GPUs get this protection, wouldn't a state actor figure out how to get around it?