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The difference is that all those thing have incentives to use less energy, PoW is incentivized to use as much energy as possible.

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No, PoW also is incentivized to use less energy, the goal is to produce more work, not simply waste energy.

That's why miners use very efficient ASICS instead of whatever computer they can find that draws the most power regardless of output.

Yes, this is such a disingenuous argument when people say PoW incentivises to use more electricity. It doesn't care about electricity, at best. Also the specific Bitcoin model even incentivises to use less electricity, because for each additional miner that is connected simulateneously, you actually get less paid per GH/(and thus kW), so at a certain point you would just not get paid anything for your electricity.

What about alternative chains ? actually I never read the energy use of eth and others.

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