https://www.techdirt.com/articles/20210820/16434547396/researchers-who-built-similar-system-explain-why-apples-csam-scanning-system-is-dangerous.shtml

Jonathan Mayer, a Princeton University professor and former chief technologist at the FTC, is one of the smartest people I know. Every time I've spoken with him I feel like I learn something. He's now written a quite interesting article for the Washington Post noting how he, and a graduate researcher at Princeton, Anunay Kulshrestha, actually built a CSAM scanning system similar to the one that Apple recently announced, which has security experts up in arms over the risks inherent to the approach.

Mayer and Kulshretha note that while Apple is saying that people worried about their system are misunderstanding it, they are not. They know what they're talking about -- and they still say the system is dangerous.