Is this a perpetual motion machine?

Very funny. The amount of water is not enough for four cans, even then a static water level would be set. There is a method of pumping little water over a large altitude difference by allowing a lot of water to drive a ram pump via a small height difference, but that looks completely different.

https://www.youtube.com/watch?v=o5ZEYMl9VIs

There is no Perpetuum Mobile. First and second main sets of thermodynamics prevent this.

Now, of course, every “inventor” asks why his construct remains and has thought everything logically in his eyes, but nature does not work for human mechanistic logic*.

Discussions are pointless, because the inventor does not escape from his logic and turns with “yes, but when”.

And then, of course, there are videos of running Perpetuum Mobiles, all of which are gratified (in some cases there is a fair Making-Of).

And then there are people who speak of free energy, but who first want a patent and investor money for the fantasy source from which to come. If then someone loses their money and shows them for fraud, they feel persecuted for their genitality because “the government wants to prevent it.”

*) The mechanical movement principle is based on the idea of a temporally causal sequence of events – A acts on B, then B acts on C, etc. However, physical interactions are called for good reason, because it not only affects A on B, but also B on A, and not causally one behind the other, but at the same time: in fact it is only an effect in which A and B are involved. Therefore, the “tracking” of a causal effect through the system is a mistake of thinking – there is no order at all.