[adventured]

Plus the US can trivially exfiltrate all the IP related to TSMC before China properly takes the island. Insiders will happily turn it over for any number of reasons.

The next step if China were to move on Taiwan, other than getting all the data and IP from TSMC's internal networks, would be to spin up a US division and assign that IP to that new corporation. And then the US should try to get as many of TSMC's employees to the US that they can.

Operation Paperclip TSMC.