They dont need to threaten other countries, they can just pass a law saying that anyone anywhere in the world selling or renting gpus to chinese companies is committing a crime. Then they can sanction any company that does it anyway and that makes it a crime for any american company to sell gpus to that company. There have already been quite a few criminal cases around the export ban.

That would be unenforceable though knowing American arrogance they would definitely try. It’s like China trying to stop their rare earths from going to American uses by requiring all companies that import them to track their usage.

Then china stops selling goods to USA for a couple of weeks until they realise there's more in life than GPUs.