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We are not measuring what YOU personally believe is "useful productive" work. We are measuring if there is a way to extract economic value (payment) for stranded energy.

> So if there's a small amount of power, you get no yield from mining.

You are going in circles. The amount of mining you can do is exactly proportional to the available power. It does not suddenly go to zero. If the yield or profit is greater than the costs, it is economically worthwhile.