This proposal is bonkers. Imagine aaaall the nudes that will have to be manually assessed by police (until they outsource it because it’s cheaper), and then you have to believe they won’t keep anything and that there are zero bad apples.
Besides, if the tools are already in place in the apps, it’s only a question of time before the detection system is repurposed for censorship of anything a totalitarian leaning government doesn’t like. Memes about our dear leader? I’m afraid we can’t allow that !
You can’t have a backdoor that works for the good guys only.
That’s how you land on my wishlist !