Recommended pre-reading: https://ethresear.ch/t/minimal-anti-collusion-infrastructure/5413
Alice slowly walks down the old, dusty stairs of the building into the basement. She thinks wistfully of the old days, when quadratic-voting in the World Collective Market was a much simpler process of linking her public key to a twitter account and opening up metamask to start firing off votes. Of course back then voting in the WCM was used for little; there were a few internet forums that used it for voting on posts, and a few million dollars donated to its quadratic funding oracle. But then it grew, and then the game-theoretic attacks came.