> ... There are times, however, when Apple Intelligence needs to leverage a model that requires more computational power than your device can provide on its own. For these tasks, Apple Intelligence sends your request to Private Cloud Compute. Private Cloud Compute is a server-based intelligence system designed to handle more complex requests while protecting your privacy. For example, when you use Writing Tools to proofread or edit an email, your device may send the email to Private Cloud Compute for a server-based model to do the proofreading or editing.

-- https://www.apple.com/legal/privacy/data/en/intelligence-eng...

There is also: "The data sent to and returned by Private Cloud Compute is not stored or made accessible to Apple" - but it can leave your computer and even way between the Private Cloud Compute and your device can be privacy concern.

way to FUD, leaking data out of the apps I choose is still a privacy violation.