Yeah I see the detail about matching hashes with well known images from a database... but what triggered my comment is this other function that is mentioned:
> The other feature scans all iMessage images sent or received by child accounts—that is, accounts designated as owned by a minor—for sexually explicit material, and if the child is young enough, notifies the parent
Which seems to be a feature that would allow parents to fix with prohibitions what they didn't achieve with education.