"The hashtag and keyword blocklists made available to Mastodon users are very useful for avoiding content that individual users want to avoid: posts about certain political events, disasters, or other personally disturbing content. However, as discussed in Section 2, it is unreasonable to expect users to curate their own filter list of hashtags and keywords—particularly as hashtags and keywords related to CSAM change with high frequency."

Are there any nostr lists that include categorized lists of things to block? Both clients and relays could incorporate those curated lists and block or flag anything tagged.

It's interesting to note that text indicators are a good vector for removing illegal images. Images can be hard to automatically detect, and are much hotter to handle. However, an up-to-date list of child exploitation keywords presents the possibility for lower risk and more automation.