As I recall, after second guessing CSAM due to the negative public reaction, they simply waited for the clamor to die down and implemented it anyway all the way back in Monterey & iOS16, and then shortly after issued a whopper nondescript “security update” to Big Sur, Catalina etc, which possibly contains it as well. That’s long enough ago, who knows what their approach is now, especially considering they learned not to make it public. After Apple destroyed the last shred of trust I had in that debacle, I don’t trust any of these companies with anything anymore. If its important enough that security matters, say it in person.
Saying that out of alll of cities in the world, only 7 have more surveillance than London and they’re all either authoritarian dystopias or about a billion people in size, doesn’t really put it in a better light.