US social media has deleted graphic pictures of US torture as "terrorist propaganda" before [0], even quite historical pictures are classified as "child pornography" [2]. For now, over 2 years YouTube has been heavily cracking down on "extremist content" by deleting conflict footage, also deleting evidence for war crimes in the process [3].

It's hard to even quantify the problem because most people are not even aware of it existing.

[0] https://www.mediapost.com/publications/article/327887/pbs-th...

[1] https://www.bbc.com/news/technology-37318031

[2] https://www.middleeasteye.net/news/youtube-ai-deletes-war-cr...