It's also worth looking at the conditions the law worked under. Up through til the 90s your semiconductors where coming almost exclusively from the West (+Japan

It's also worth looking at the conditions the law worked under. Up through til the 90s your semiconductors where coming almost exclusively from the West (+Japan, in this case counting the same though) - also the only place you could get all the different high performance products you needed designed at. If you want to avoid both sides of that coin you've got decades of catching up to do. Of these gaps one is already eroded and the other is significantly smaller in that China already has domestic 32 GB 10+ TFLOP GPUs and supercomputers made of domestic CPUs. Will export restrictions slow things more than doing nothing? Sure, but it may not be particularly meaningful just because it worked well when we had the same idea in the 70s. It may, for example, instead be the kind of thing to put enough market pressure to move the tasks to happen somewhere else.