https://www.wired.com/story/apple-photo-scanning-csam-commun... This scandal about scanning your end-to-end encrypted photos on one of the ends, kinda defeating the purpose and reducing everyone's privacy. It lead directly to the legislation that Apple is coming out against today, which I would call ironic but is very predictable. How dare governments require us to do this thing we already planned to do.

That CSAM detection method was something that apple published a whitepaper about to get feedback. The feedback was strongly negative, so they never implemented it.

I would hope that the grandparent was not referring to this thing that never existed as "the client side scanning ability that is built into the OS."