@UrsaAshBear He boosted a post about an AI here censoring a painting thumbnail.

The most we can say about it is the image has been marked as "sensitive" and so the thumbnail shows as blurred.

There may have been many reasons for it being marked so (someone reported it to an admin, an admin saw it, it contravened some server's rules and a request was made), but here AI is not the most likely answer and there is no way the original poster could know it is an AI that has done that.