It doesn't sound like this to me. The users vote with their computational power, not by running node(s). Someone could achieve having the majority of the nodes and act maliciously very easily, but the system would be unaffected from such attack. The so-called “Sybil attack” works if your vote matters, which means that you need to mine along with having lots of nodes.

There are some ways it benefits the network, but 'til there. You aren't voting for anything if you run your own node.