What do you think about existing solutions regarding decentralized exchanges like GateHub (https://www.gatehub.net )?

Gatehub is a Bitcoin, Ripple, Ethereum, Ethereum Classic and Augur wallet. It also allows users to store, send and exchange these cryptocurrencies in a built-in exchange. All private keys and passwords are hashed and encrypted using industry standard algorithms, even GateHub cannot access them. Do you think this is a solution that will prevent exchanges manipulating the prices?