Apple doesn't trust other providers. See, for example, the ongoing attempts by Facebook & co to exfiltrate as much data as possible. A theoretical Facebook alternative here to super-Siri would have a pipe to slurp up the entire phone's data.
This kind of thing overlaps with the anti-competitive practices driven by Apple's MBAs (like the whole thing with Epic), but it's a genuine concern and one their engineering people think about a lot.
This kind of thing overlaps with the anti-competitive practices driven by Apple's MBAs (like the whole thing with Epic), but it's a genuine concern and one their engineering people think about a lot.