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Because even when you're not paying for electricity, there's much more profitable coins to mine.

• mrtksn 9y ago
  That doesn't mean that CPU can't mine bitcoins.
  • saagarjha 9y ago
    Just because you can doesn't mean you should. If you're not going to make money mining Bitcoin, then why do it?
    • mrtksn 9y ago
      Are we mining Bitcoins here?
  • lifeformed 9y ago
    You can mine bitcoins using pen and paper too.