In PieFed v1.4 it will be possible to label posts as having AI generated content. Labelled posts will get a little badge near their title, similar to how nsfw and nsfl content is labelled. Mods and authors can change this value on a post in the same way they do flair and nsfw, using the little tags button in the bottom right or in 'More options' when editing their post.
Account settings for blocking:
Similar to how NSFW works, each user can control how those posts are listed on the home page, etc. The default is 'Label as AI', which just adds the badge. People averse to AI-generated content might want to change this to 'Hide completely'.
Also similar to NSFW, entire communities can be assigned as 'AI content' and that will auto-tag every post inside as being AI generated. If the community mods have this value unset (e.g. Lemmy communities, which don't have this functionality) then the instance admin can manually override the community's AI Generated setting.
The mods can label them
will they? mods who are okay with AI content wouldn't care. mods who don't like slop would just remove the post.
People can block an entire community, preferring others instead where the mods keep out those kinds of posts. Nothing is perfect but this is a new tool that has potential to help people get what they want. e.g., is there anything wrong with NSFL posts, or bots, so long as they are properly labeled as such? If this tool helps organize at least some of the mess, then it can be helpful some of the time?
Ofc, only in PieFed communities, and for people with PieFed accounts. Though if Lemmy likes the idea then perhaps it can add it as well (same for Mbin, nodeBB, flarum, pixelfed, Mastodon, Loops, etc.).