https://www.bleepingcomputer.com/news/technology/researchers-show-that-apple-s-csam-scanning-can-be-fooled-easily/

A team of researchers at the Imperial College in London have presented a simple method to evade detection by image content scanning mechanisms, such as Apple's CSAM.

CSAM (Child Sexual Abuse Material) was a controversial proposal submitted by Apple earlier this year. The proposal was eventually retracted in September, following strong backlash from customers, advocacy groups, and researchers.