Really bad. A good estimate of an average continuous power output of someone a bike might be about 100w unless they’re a trained endurance athlete. Even if you could recover that with perfect efficiency, at a rate of 15 cents or so per kWh of electricity, that’s a gross revenue of about 1.5 cents per hour of activity.
If you’re paying them minimum wage for that, that’s still a horribly cost efficient electricity source.
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