Even with ADP on, it uploads the unique hashes of the PLAINTEXT of every photo to Apple, so they know who had what unique files, when, and who had them next, and when, etc. You can’t receive or transmit an original Winnie The Pooh meme between two phones with ADP on without Apple and the FBI knowing who had it first and when the second person received it.

Also insofar as ADP is off by default the whole system can NOT be said to be “privacy oriented”, which was the claim I was refuting.

Apple, for the most part, does not care about the privacy of their users. ADP would not be built today, and it will probably eventually be quietly removed (like it was in the UK), because ~nobody uses it.