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Here you are protected: you can't use more than the what your computer's power supply is sucking from the grid :-) You "donate" in proportion to your PC's power supply. Imagine you have a PSU of 0.75 kW and you keep the page open at 80% for one hour, you increased your electricity usage by a maximum of 0.75kWh which where I live costs about 10 eurocents.

Now if your issue with the fact that doing this on a vast scale will increase the overall power consumption all over the world, I'm not worried but it would take me a full post to explain why.

You are very right. I agree with you.

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