Because to me, they seem like de facto "Agree and “Disagree” buttons, whether or not it was the intent.
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It really depends on where you use them.
In some communities I’ll use upvotes as a way to track which posts I’ve seen.
In news communties I always downvote tabloid sources and clickbait headlines, regardless of content.
But when it comes to the comments, it’s mostly an agree/disagree button.