Seems to me that some of the problems you mention are solicited by the platform itself. If you offer people an opportunity to get paid, they will react by trying to get paid. The app "GasBuddy" exhibits similar problems, in that it holds out the promise of potential monetary reward, so users may simply invent fuel prices without bothering to check them for accuracy. It's the money they want, not accuracy. Steem encourages the same behavior.