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.
People on Mbin and Kbin do not automatically upvote their own posts. I would guess at least some of those posts were because of that.