TSMC doesn’t get to take the profit that currently accrues to Nvidia and Apple, even though they absolutely could from a business/leverage perspective, because they are an economic colony of the United states and hiking their prices (which Apple and Nvidia would have almost no choice but to pay, but would upset their benefactors) would jeopardize their national security/defense.

In a world where TSMC is functionally capable of the same level of production but not in such a complicated geopolitical situation regarding semiconductor manufacturing, things would be quite different.