The smartest thing Apple has done in the past decade is buy TSMC a factory. They just gave a TSMC a factory for free, with the deal being they have guaranteed time every year, no fighting.
That's what let them make their own laptop cpus, time. The M cpus aren't good because of arm, or apple geniuses, but rather TSMC bleeding edge tech and high yeilds. And of course, every company that didn't buy TSMC a factory has to fight for time, meaning everyone else loses out.
The costs of being a bleeding edge chip fab make reproducing tsmc elsewhere unattainable.