[neolog]

I'd say the primary differences are that the CSAM scan is a perceptual hash rather than a regular file hash, and that the technical infrastructure of the CSAM system is designed from the ground up to be used against (rather than for) the user and report them individually to authorities for violation.

[floatingatoll]

Do you have an alternate design in mind that is both "used for the user", and is also effective at reporting CSAM content being uploaded from the device, without allowing CSAM abusers to opt-out of that reporting? I haven't been able to come up with anything myself, but maybe you've had better luck.

[neolog]

I can only point to other people who know more than me.

https://stratechery.com/2021/apples-mistake/ is a smart tech commentator

https://www.nytimes.com/2021/08/11/opinion/apple-iphones-pri... are two security/encryption experts