The distinction Apple wants to establish
Apple's Google partnership for Siri AI goes beyond the Gemini model powering responses: MacRumors clarified a technical detail Apple is keen to emphasize. Siri AI cloud processing runs on Apple's own servers physically hosted on Google's infrastructure, but the Private Cloud Compute architecture is designed so that data remains inaccessible to Apple, Google, or any third party.
The distinction matters: Apple is not simply sending queries to Google Cloud and receiving answers. It is using Google's hardware and network as a substrate while retaining full control of the software stack and data isolation. This is the same Private Cloud Compute principle described with earlier Apple Intelligence versions, now scaled up through the Google agreement.
The trust problem
Apple stated explicitly that cloud processing is 'handled such that data remains inaccessible to Apple or third parties.' This phrasing is intentionally technical and leaves open the question: what cryptographic or legal guarantees exist to verify this promise? Pending independent audits — which Apple has not yet announced — the statement remains, for now, a fiduciary declaration.