When they downvote they earn coins ... it means they make money. Simple stradeegi what they do, they create a problem so then aggressively offer a solution for what they have is Downvote others . It is very BIG problem and it can be close when top users say it must stop, but when they not do this... it means theyraping the platform deliberately just for there own benefit . I see it to lot on HIVE now and it not going to end good when all not start say something.