This is bad. Mastodon instances need tooling to automatically detect and ban abuse (or flag for manual review), and to automatically defederate from instances that don’t ban abuse https://www.washingtonpost.com/politics/2023/07/24/twitter-rival-mastodon-rife-with-child-abuse-material-study-finds/
Twitter rival Mastodon rife with child-abuse material, study finds

The report raises safety questions about alternative social media sites.

The Washington Post

@micahflee If you mean a badly handled study, you’re right.

They included in their report instances that have been defederated from the core of mastodon.

It’s possible that there is a problem with mainstream mastodon but this study doesn’t show that at all.