It just requires the slightest skepticism to think "Sound cool, but why hasn't someone done it before?, I'll Google Fontus and see if anyone has critiqued it."
This is where something like Rbutr comes in, a friend of mine developed that and it's a browser plugin that crowd sources critical opinion of the webpage you are visiting.
It is surely a good tool, but for people that already do possess the required skepticism to see the need for it.
Skepticism is the key, not the ability to technical analyse something. PHY101 is no good to you if you don't have skepticism and the inclination to ask questions.
People die of thirst and probably not in regions at 95% humidity where there are simplier methods of condensing water.
I mean... going to the electric kettle and check how much power it has (lets say ~2kW). Check how long it takes to boil a kilo of water and check how long it then takes to convert all of it to steam while monitoring energy use (practically what thunderf00t showed). Not that big of a deal to make - compared to hundreds of dollars of an investment.
Maybe it mentally blocks people that the heat pump is operated backwards. Maybe they overestimate the power a solar cell can deliver.
But probably this is just another case of group psychology surpassing logical thinking. Lots of wishful thinking is happening and assumptions are made and stated as facts. The internet with its fast communication capabilities amplifies not only the good things, but also the bad things.
I would´t have thought that those guys actually get that far with it, on the other hand scammers always build on trust and are able to scam millions out of their victims. I don´t really buy the "oops, we got that part of physics wrong".