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> There are a ton of owners sitting on inefficiently used IP space.

This includes AWS, btw. You effectively get a public IPv4 with your instance, regardless of your actual needs. It actually increases your costs to get cloud instances that don't do that.

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AWS has that inefficiency baked in to their design, but I'm guessing that they do efficiently deploy their IPv4 space.

That is still a problem for sure, but I thinking of places doing things like giving a printer its own subnet just because they have no incentive to be efficient.

You only get a public IP if you host in a public subnet. Should you deploy to a private subnet you wouldn't get a public ip

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