Some bots were put into place when Lemmy started getting lots more traffic to try and help fill content, since not having a full Fediverse to jump to from Reddit was off putting to some. An attempt at retaining users, basically. What I don't like about some of them is how they'll dump the link as if it's content, but it's only a link back to Reddit, and not nearly the same as someone actually posting something here and discussing it. They still can spark something, if people don't realize it's just a bot. Don't know what ratio posting is these days of bot vs actual person, or even if you could tell a lot of them apart sometimes.