[tehjoker]

If China took Taiwan, they would be selling to the rest of the world most likely. However, perhaps they are planning for a case where the US bombed the crown jewels to maintain supremacy. That would create profits for a domestic sector.

The USG is perfectly happy to spend taxpayer money and foreigners' money to make their corporate constituency happy even if the financial equation is overall negative.

[PeterisP]

I don't think that there is any plausible scenario where China takes Taiwan chip fabs intact - if they are not disrupted during the conflict, I strongly presume they would all be intentionally blown up as soon as invading forces get a beachhead.