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AWS isn't a utility because utilities sell commodities for which you can switch to a competitor easily, as you're buying the same thing. There are companies selling similar products to AWS but none that sell AWS itself.
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Early utilities tend to not be built on standards. See how early electric utilities within a country or even a city couldn't agree on voltage, frequency, phase, or even AC vs DC.
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The fact that electricity was quickly commoditized does not guarantee that AWS will commoditize.
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S3 is. But obviously not all of it.
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Still, there is a difference of degree. The engineering cost of making one city's electrical grid compatible with the consumers of a different city's grid were much lower (even if one grid was AC and the other DC) than the engineering cost of moving from AWS to a competitor because electricity is not that complicated.

Also, I doubt anyone was referring to electricity as a commodity in the early days before the industry developed standards.

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Aws is closer to monopoly than to utility
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A monopoly with at least 3 major competitors and which exists because it created a new thing, not because it controls a fixed shared resources.
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Most utilities are monopolies.
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most utilities are natural monopolies. The cost to run wires/pipes to my house are a significant portion of the cost to serving me, so you wouldn't run wires to my house in hopes that I buy from you later.
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