By definition, an AI assistant needs read-write access to all your data. We've seen enough reports of badly implemented AI here, we've seen enough scammers exploiting data troughs...
As a EU citizen, sharing your data between Apple and Google which puts said data under free-for-all US intelligence access - which is known to have "questionable" habits and give basically no rights or insight as a to-them foreign citizen - is effectively trusting "some secret service".
To be clear, I am not one to fear use Apple for intelligence reasons, but not through a pretense that my data is safe from it, and certainly not because I believe it would be safer than using, say, a service based in Germany or France.
I'm more concerned with data brokers trading personal data out in the open, collected with minimal control from all the other apps and webpages we use throughout our day.
If Trust Zone is usable for other assistants, it is usable for Siri AI too: that's the whole idea behind DMA.
They do not. Per Apple's documentation, they run on Apple's Private Compute Cloud [1] - while part of Google's GCP, full confidentiality is guaranteed that even Apple itself is not able to access user data.
That's more of an effort than I see any single competitor even attempting.
[1] https://security.apple.com/blog/expanding-pcc/
[2] https://machinelearning.apple.com/research/introducing-third...