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Exchange Banks like Circle are much more prepared / technologically safe than Mt Gox - which was ahead of itself, and primed with corruption and stupidity and greed. The new Exchanges are slick operations run by the same insiders that run the current Fiat Banks.
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What if people behind Circle or Coinbase become greed? There is no way you can prevent that from happening! People used to say things like this before Mt. Gox stole their money.