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That's the first time I hear of Matrix having this issue.
I'm curious to know more, but the video only cite an anonymous source. Are there evidence or more technical details available regarding this?
The problem is the evidence requires linking to channels hosting CSAM, so nobody is going to provide that for you.
I'm interested into the technical details, not actual URLs. How come servers cited in the video keep hosting/seeding chatrooms despite closing corresponding accounts? Is this impossible due to Matrix's design, or is it poor moderation from server admins?
About URLs: the author is absolutely right to blur these. The only people he should be sharing this is police, or maybe admins if they're not aware of the abuse on their server.
Is this impossible due to Matrix’s design, or is it poor moderation from server admins?
Kinda both. The design does not inherently destroy rooms permanently afaik, and server moderators don't do enough to prune bad things either way. It's a never-ending game of whack-a-mole. People have also been (ab)using its file upload capabilities to use matrix as a global, free, unlimited CDN, sometimes even for completely (to normal users) hidden content using custom message types hiding in plain sight.
Thanks for the explanation. I'm considering Matrix but will hold off, at least until v1.11 or v1.12 solves the unintended CDN issue described in another comment here, cf https://matrix.org/blog/2024/06/20/matrix-v1.11-release/#continue-reading