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.
Lemmy has a setting to hide bots globally if you'd like. Most of the reposts are done by just a few bots and yes I agree they serve no purpose but to spam content nobody cares about, thankfully it's easy to fix.
I am glad you made that comment and you should not be sorry ; it's a good joke and the person to whom you wrote that should have read again before sending the comment.
Of course the error is bug instead of big.
To be fair, at least that kind of bot post starts organic discussion and engagement within the community. The bad ones are the bots reposting reddit content like AITA where the OP will never see the comments anyway.
It seems fair to warn users as I had moved from posting the daily post myself to using a bot, that some of the people interested in that daily thread would not see it if they blocked all bots.
Anyway, if you find it daily spam, just block the community and move on.
You would still have to block it if I posted that thread myself.