6. Tidal currents ARE used to produce electricity in some places.
What is "drained" is the momentum between the earth and the moon which happens whether or NOT tidal motion is utilized. Extracting some of that kinetic energy does -slightly- increase the rate of reduction of angular momentum but compared with the available energy is virtually infinitesimal. At some far future time, the moon will "slow down" to exactly match the rate of rotation of the earth. (It won't 'move' in the sky any more.)
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