I do absolutely agree with @knzhou, but going to provide a couple of points here, more intuitive than scientific.
A satellite can spin for quite a long time since the kinetic energy of it doesn't decrease significantly (it doesn't mean that the energy doesn't decrease at all - it does, and for that reason a satellite will fall down eventually).
Now if we're going to harvest any energy with the aim of having a "profit", we would just "drain" it's kinetic energy, its speed will decrease at a greater rate, hence the satellite will fall noticeably sooner which would make the benefit of launching the satellite way less than the proposed benefit.
In other words, that's like trying to harvest an energy from a freely moving object. Harvesting would be pointless since the object would stop because of harvesting and you won't gain nothing.
I.e., you thought you have harvested the energy, but in fact your object has just passed all its energy to you and left with nothing, which is not what harvesting energy is supposed to be.
A side note regarding "perpetual motion" - it could be perpetual only in that ideal case when the energy is not lost. If you try to harvest energy from an object in "perpetual motion", the motion will no longer be "perpetual".