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I think it will hurt the market in the short run and make it stronger in the long run, if Poloniex and Bittrex stop servicing U.S. customers as well I will have nowhere to buy altcoins except for maybe a Chinese exchange that doesn't care or Shapeshift.io this just means there will be a greater demand for decentralized exchanges like Shapeshift that don't have boarders or boundaries. # Dont keep your coins on an exchange.....