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Like cryptsy and mt. gox?

They are not family, they are businesses that are profitable now, but may not be in the future. Experience has shown us that a lot of crypto companies exit scam when they run into trouble. Do we really need to keep learning this lesson?

Btw I'm not accusing anyone of anything, it's just bad security to share private keys or even to keep too much money in trusted places like Coinbase or Poloniex.