Why not start with autotagging image posts with no alt text with something like Mastodon’s #Alt4Me? It summons the human element to help submit the data, instead of depending on AIs that we all know the stupidity and evil they do.

refuse “image post” without alt text.

Mostly* works, but increases significantly the barrier of entry to engage in “conversational” / “collquial” fediversing, and subjects the largest groups of people to the limitations of their tooling.

when you upload picture, you must provide their alt text, if there is no alt text, the picture will be deleted.

I assume this is for when you attach a picture to an otherwise text / link post? In that case, I think this is a very good path, yes, since in this ase the user who is adding the picture is already engaging in the extra work of getting it.

hide user post based on alt text and remove post score if the alt text is bad.

No CCP style shit please, we already have enough of that with Piefed.

Adding posts with no alt text to a predefined category or tag (such as Mastodon’s #Alt4Me) sounds like a reasonable alternative.

I thought we were anti AI…?