It could be extremely lucrative if they get it right.
Simply trying to copy TSMC would also be a poor strategy.
Companies have "core competencies" (or should). The manufacture (not design) of high-end silicon has never been one for any of these companies except Intel, and they have just lost big time.
… but the shareholders are global?! That’s not really a compelling argument unless you made it a requirement that all major/strategic companies must have 100% domestic ownership!
BUT - all you then need to do is create a Delaware LLC that buys the strategic stock, which is owned by $SCARY_FOREIGNERS
Intel couldn’t because the science is too hard to do with the scale of only your own designs. Intel had to stop competing with their own designs and open up their fabs like tsmc.
If it were that easy, Apple, Amazon, Google AMD, Nvidia, etc who all design their own chips would have done it.