Perpetual motion machine

You’re thinking earth terms here. So define ‘space’. There’s no more energy in a spinning object than a non moving object, energy was used to spin the object not continue spinning it. Same thing as continuing in a straight line until acted upon. Which in deep ‘space’ would be 99.9999% to 100% nil. Earth is moving at 18 miles a second, been doing that quite awhile. What happens out ‘there’ works different than on earth
And you are thinking in limited time spans and size of energy densities.

The equation doesn’t care how much the size of the drain is nor how long it takes, just the rate at which energy is drained. It may take millennia, but the energy will be drained eventually and the system will go to zero.

It’s a fundamental law of physics.