It is profitable for a botnet -- that is, if someone else pays for electricity.
You need to earn minimum amounts before you can receive a payout share or, worse, solo mine a block. With the asymmetric advantage provided by optimized hardware, your expectation time for finding enough shares to earn a payout using cpu mining is in the centuries to millenniums timeframe. This is without considering rising fees that raise the bar even higher.
If it's worth saying, but not worth its own post, then it goes here.
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