A lot of this behaviour is inevitable when you are paying rewards and there's no central control to police it. We only have a few thousand users and how many of those would be seen as having real value? If we got to millions then the proportion might still be the same. Scaling up will make Hive more viable, but also bring big challenges. I don't have the answers.
Well I have one answer.
I am the police :)
Yeah, hard to scale, but for know I say we police fairly good and we have a lot of spare capacity.