The Media Bias “fact checker” bot is propaganda that attempts to push the Overton Window to the right. It calls objective reality “leftist” all the time.
Those wouldn't be detectable in quite the same way as the reddit "repost a post from awhile ago that got a lot of upvotes because that post is proven to be popular" type karma farmer bots though, I'd figure? Especially given that AI nowadays would allow for them to not just repeat the same comments
I wasn't commenting on whether bots actively are on Lemmy, only pointing out that pushing propaganda would be what a bot would do since farming karma is useless.