Earlier quoted context omitted.
Considering Apple funds a lot of TSMC's R&D I dare say they have a lot of leverage if they really wanna push it.
But Apple needs TSMC. Not saying you’re wrong, but TSMC also has leverage. TSMC doesn’t want to price Apple out, but at the same time, Apple can’t just pack up and go to a competitor. At the nodes they’re working at, going to a competitor could require a complete relayout with new design rules.
Sounds like they're playing a game of chicken.