Even if we make the not-particularly-reasonable assumption that Apple would want to own a fab, and the wildly unreasonable assumption that they would accept any outside customers for the fab: building a fab business from scratch to something competitive would take on the order of a decade or more even for a company with Apple's resources. And if Apple bought somebody else's fab business, it seems most likely that it would be Intel's and there would no longer be an Intel do design chips that would be in search of a foundry. (Intel has the only relevant logic fab business that could plausibly end up getting sold off to the likes of Apple.)
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Even if we make the not-particularly-reasonable assumption that Apple would want to own a fab, and the wildly unreasonable assumption that they would accept any outside customers for the fab: building a fab business from scratch to something competitive would take on the order of a decade or more even for a company with Apple's resources. And if Apple bought somebody else's fab business, it seems most likely that it would be Intel's and there would no longer be an Intel do design chips that would be in search of a foundry. (Intel has the only relevant logic fab business that could plausibly end up getting sold off to the likes of Apple.)