Funny stuff. Apart from the yet-another-BS-perpetual-motion-generator factor, the meaning of "free" as far as energy is concerned is worth questioning, as a couple others have done above.
To begin with, something is "free", I guess, in the usual/familiar sense, if you don't have to "pay" for it. Of course, as someone has mentioned above, you still have to pay for the device that generates electricity from whatever source. And even if you exclude the initial cost in your definition of "free", there is still the maintenance, and eventually replacement costs. No physical device will function without any maintenance, and will last forever. So even if you find a free source of energy, tapping into it is NEVER free.
A good example of that is obviously solar energy. Solar radiation IS in itself "free" (at least until governments decide to tax it), but the devices to extract this energy into some useful form are definitely not free, definitely require some maintenance and won't last forever either.
It's both sad and funny to see that there still is a significant number of people who think perpetual motion could be a thing. Should be obvious *why* if you have some basic scientific education, but even if you don't, you can still consider the fact that absolutely nothing lasts forever in this universe, at least as far as we currently know. But you could reply that even that requires some basic knowledge.
Anyway, all those videos are not there to offer the world any solution (even if that was in a delusional attempt from their authors), but just to make views on Youtube, which, ironically, doesn't generate any electricity, but does consume a lot.
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