I’ve occasionally noticed ordinary comments with zero upvotes to them. Yet, our own comments are upvoted automatically whenever we make them. So for comments to have zero upvotes, either something I don’t know about is happening, or there are people who downvote their own contributions.
I can’t help but wonder, why? It seems like extra effort without a clear reason.
If I post a comment and someone afterward posts a better comment that renders mine superfluous, I’ll usually delete my comment to give the better one more visibility. But if someone has already replied to my comment, I’ll leave it for the sake of context, but downvote it to make sure people see the better comment first.