Hardware

Oh ok, only Apple and Nvidia. lol. jk

TSMC is an $800B company for a reason. But they aren't irreplaceable, just convenient relative to where Apple/Nvidia do the bulk of their manufacturing (in and around Hong Kong and Shenzhen).

you believe losing TSMC would only hurt Taiwan?

As a domestic policy, Taiwan needs TSMC more than the US, because Apple/Nvidia can always pivot to another semiconductor manufacturer but Taiwan can't just wave a magic wand and regain a once-in-a-century fluke of economic prosperity. If you're really worried about a Chinese invasion, why would you obliterate the breadbasket of the nationalist base of the Taiwanese workforce? It would be like the Saudi monarchy threatening to blow up the Kaaba. Literally the reason you have a base of power at all is this enormous socio-economic touchstone that your loyal professionals control.

Personally, I’d immediately run out to buy the most expensive graphics card I could afford.

You'd be overpaying into a market everyone was panic-buying into at that moment. Far better off to scope up as much SMIC stock as you could afford, as that's who will be producing Apple/Nvidia's chipsets into the foreseeable future.