Moreover, such actions of creating bitcoins out of thin air would make them vulnerable to market conditions and cause them go bankrupt in no time.
I strongly suspect that if they are doing this, should they encounter any "runs on the bank" they'll just throw up a technical difficulties message.
Recently I sent some ltc to a friend's Coinbase account. 8 hours later I asked if he got it. He hadn't, but it showed up seconds after he entered the help chat, which was also having issues.
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