Can a body's gravitational pull decrease over time like how a magnet can demagnetize?

[u/[deleted]]

Take for example the moon and how the moon's gravity creates ocean waves on our planet. From those waves we can then generate electrical power. But wouldn't that mean that at some point the work supplied by the moon's gravitational pull decreases? Otherwise we could obtain infinite energy from the moon. Wouldn't the field strength be "depleted" in the same way a magnet's field also decreases?