Do you have references for this? I must have missed this part.
This sentence:
> Next, iOS and iPadOS will use new applications of cryptography to help limit the spread of CSAM online
seems to suggest that the hash-matching happens only on iOS and iPadOS.
The rest of the text OTOH suggests many things happen across all types of devices and OSs.
Regardless, this seems very bad.
ETA: Apple quote: "unreadable set of hashes that is securely stored on users’ devices". Unreadable, unleakable, no doubt uninterpretable... unless someone reverses them to get a blurry 'visual proxy' collection.