Feeds are littered with repost bots recycling mindlessly internet trash. Not rare is to see series of exactly same posts from different communities with no comments.
Say what you want, Reddit got this one better
I think reddit bots are there to promote specific content and create a synthetic sense of engagement, which spurs organic engagement. Its part of the business model.
I have a conspiracy theory that this is how Marvel got to be what it is today.
I usually find it difficult to tell if I’m interacting with a bot on Reddit (unless it’s of those novelty bots with bot in the name). I think there are definitely a lot of higher quality bots on Reddit that are designed to hide their true identity and intent whereas on Lemmy the bits tend to be more obvious and visible.