Honestly, I'd argue that in a sense there shouldn't be a mechanism to prevent it, because Steem can only be successful if money is flowing into the system. Where does the money come from? Politics and advertising. Some of that will be distasteful, but without it the financial future of Steem withers and dies.
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Money can keep coming in from private sources powering up to gain influence in the community. I don't know how sustainable this will be as Steem scales up to the millions though.