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.
Artist’s view of bacteriophages, viruses that infect bacteria and look like this. They attach to the bacterial wall with these fibers that look like spider legs, and then inject their DNA into the bacteria by contracting the sheath that attaches to the DNA-containing head. They kinda work like a syringe.