Apple needed to be kicked down a peg. Who was it going to go to for its next chips? Samsung? Intel? LOL. TSMC called Apple's bluff. Apple might leave in the future, but only if it can start building its own fabs. (That's a joke. Apple isn't going to make its own fabs.) I don't think anyone currently has something superior to TSMC N5, never mind N4 and N3. Apple literally had no other potential manufacturer unless it wanted to make its next-gen chips worse than the current gen.
If you've been around this space a while, you know what happens next. This kind of thing has happened before with Fabs, modems, sensors, cameras, and displays with Apple. They've been in a single supplier situation where they lose price control before and they absolutely hate it with a passion.
In every single instance Apple has diversified, and while TSMC may be the only place for "N3" class parts right now they most likely will not be the sole source in 12 months.
Apple doesn't have to 'switch', they can just have a percentage done elsewhere. I wouldn't be surprised at all to read 2 or 3 years from now how Apple had started a group to port to alternate nodes like Samsung 3 or Intel 3 many months before this happened, anticipating it. Or perhaps, have been doing it all along.
Apple's sales are going to be bad too, which likely will make them put more pressure on suppliers. The iPhone 14 is a dud, regardless of whatever marketing and fan hype is out there the 12, 13, 14 don't just look the same they act the same to 99.9% of users. Not enough of the Pro will sell to offset that. Count on it.