Yes communities is probably the best option for control. There is no way to block downvotes, the chain would need to be fundamentally redesigned because spam farmers, plagiarists, etc would just block everyone from downvoting them and that is the antithesis of the whole proof of brain concept. It relies on the public aspect of all stakeholders having a decision in rewards
RE: Hive community is getting mad at @cryptofinally but she's right about this one