There's much more to Taiwan than just chips for china, it's a wealthy country for lots of reasons, and they've wanted it even before it was wealthy, it's home to their political rivals they've been trying to kill for the last century, chips are only in the news at the moment because that's the US interest in Taiwan.

And besides that, just going scorched earth and leveling the playing field, if China can't get them, at least the US can't either.