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Downvotes are s needed thing when dealing with a staked based platform run on inflation. Without the ability to disagree on rewards, there would be no way to fight abuse, and the whole idea of Proof of Brain goes down the tube.
With staked based reward disagreement is going to come displeasure on whoever gets "downvoted" - there isn't a way around that. The only thing we can do is soften the blow as much as possible.