Energy is created, and destroyed billions of times a second as the universe is created and recreated.
Modern Materialistic Science says Aether doesn't exist, so, also, Laws of thermodynamics says, you can't get energy from the aether.
Also, the next Law of Thermodynamics says that everything runs down. So perpetual motion machine can't exist.
It is intertwined yuckiness.
Except that everything does not run down. It's a balance of creation and destruction.
Science™ keeps the truth from Us. Free energy makes money pointless (all money, irrespective of form, accounts for Our energy added into a system at its foundation), and the moneyed psychopaths in control on Our planet (by virtue of money) surely do not want to lose Their power tool.
So... They do all They can to hide free energy.