The point is that if the capability for "the iCloud Photos client" to scan your photos before uploading them to the cloud exists, it's only Apple's policy that stops it from scanning all of your photos.
That capability obviously already exists independent from this CSAM-scanning system.
Re:Apple’s Mistake
by mixmastamyk on Monday August 09, 2021 @05:54PM
(#28122792)
Yes, they were already doing facial recognition of my photos, which I didn’t ask for and can’t turn off.
Would it be any different if Dropbox was scanning files before it uploaded them rather than afterwards? It already computes hashes of your files on your device so that it doesn't have to re-upload existing content, so I honestly don't understand the objection to doing image scanning on your device before uploading your content.