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There's a really interesting Sam Harris pod cast on this subject.
https://samharris.org/podcasts/213-worst-epidemic/
It's been a while since I listened but tells the story of how Facebook was the largest platform for child pornography going, but only because it was unencrypted so the number of reports and prosecutions could be defined. When Facebook encrypted those numbers zero'ed and the reality is that all platforms that employ encryption get to abscond from the responsibility of hosting such material because 'they don't know it exists', the numbers from Facebook are absolutely staggering though so painfully they all know it does exist and the longer its been around and proven to be well encrypted the higher those figures are.
iOS 15 update. Scans photos on phones for 'inappropriate' images.
Obv child abuse images are universally inappropriate, but (among other things) concern about whether governments could force Apple to enable similar tech for things the regime of the day deems inappropriate
https://www.independent.co.uk/life-style/gadgets-and-tech/apple-iphone-photo-scanning-csam-b1903328.html