[hackerfactor1]

All perceptual hashes, including AI-based perceptual hashes, have a "projection" property. If you have the hashes, you can project them into some kind of image. Some hashes result in blurry blobs (pHash, wavelet hashes). Some result in silhouettes (aHash, dHash). And some show well-defined images (PhotoDNA).

We don't know how Apple's solution works. But if it can project recognizable images, then it means people can use Apple's hash system to regenerate child porn.

Without details and an actual code review, I'm not willing to accept Apple's assurance that an image projection isn't possible. We hear that same promise from Microsoft's PhotoDNA, and it turned out to be false.

Imagine the problems if every iPhone and every Mac was in possession of child porn because Apple put it there...

Yes, this is a lot of 'if's, but until it has been evaluated, it is in the very real realm of possible.