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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.
Let me be blunt.... The New People behind Circle/Coinbase are the Old People behind JPMorgan/Goldman etc. I know how they steal things. I know the rules behind it and and I well versed in using that to my strategic advantage. But I am afraid they will learn new tricks with the advent of digital.
But they aren't strong arm robbers. They don't just make your bitcoin "Go Away". They schmooze it out of you with fancy cons. The early days of Bitcoin / Mt Gox was like hte wild west. Strong arm robbers just blatantly swiping your $#!T in an unregulated system. This new breed of exchanges will steal from you in a regulated manner - exactly like the old system they ran.