TSMC in the US is a bit of a special case .... wouldn't surprise me at all if they were virtue signalling to the Trump admin more than anything with what they are doing there.
TSMC US federal plant funding was under Biden not Trump (CHIPS act)
Trump did do the initial deal though, but TSMC had to cough the money up for that
TSMC wouldn’t put tens of billons of dollars in irreversible investment just to virtue signal, the scale is too large
You can’t “undo” a fab
How so? They are diversifying their production chain so that all their eggs aren't in one basket. Taiwan might be threatened one day but their US, Japan, and German plants will much less likely be in the same danger.