For the record, I think it was also discussed here some time ago, but there are similar offers like that:
https://www.gdstechnologies.ca/I'm still puzzled by the business concept. E.g. there are many scams like audiophile stuff or "water purification", even esoteric/medical stuff that mainly rely on feelings (the sound "feels" betters, the water "feels" more healthy etc.) so a lot of customers will be actually satisfied. Indeed, you could call in a win-win situation especially for non-medical scams where the scammed don't feel cheated but even defend the product.
But with this free energy nonsense, every customer must come to the conclusion that he was cheated in the long run. Like the electricity bill can't get smaller, the self supplying USB charger must reach a point where it can't charge anything etc. So I can imagine that you could make some money with cheap products and a hit and run tactic or mock up a product to cheat investors, but building expensive large scale devices that you can only sell once to each customer with no chance of buzz marketing seems like a safe way to fold after a relatively small amount of time.
The only similar example of a semi-successful scam company that I'm aware of is "
Aquapol" which promises to dry out of walls without electricity or chemistry. Their devices are cheap mockups though (more or less empty plastic containers with two "spiral" PCBs) and the long term model is to lure people into oppressive maintenance contracts.
So I'd imagine that "Infinity Sav" (and the like) could use the same approach and still: while drying out a wall is something that can be proven to work or fail, I guess it's easier to come up with excuses why it doesn't work and prolong the inevitable compared to a "generator" that simply can't produce more energy than it consumes. Adding that there are no development costs for the Aquapol thing at all and production costs are very low, it's easier to understand how this business model could survive quite some time now.