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It was always "meant" for disagreement of rewards too. However, this has nothing to do with that. Appreciator wants to keep all of their large cut of the curation, Newsflash bites into that with a 10% downvote. Because the delegation appreciator has is so large, they can downvote newsflash-supported content 100%.

It is a bit silly, but they seem to think it is important enough for them to waste their time on.