Well, a lot of people still prefer reading actual books, and will pay money to get the same information they can find on screen for free or cheaper in the form of a bounded book. I wouldn't, but I know many people who would if it was something they were actually interested in. So the concept isn't too bad, I think, but the execution in this case is pretty awful, with the lack of proof reading, steep prices, too much automation involved (and while as much automation as possible in computer systems is usually a good thing, when the source material isn't guaranteed to be correct, it will often fail), lack of information about the sources on product pages and the whole company just seems sort of shady.
But I wouldn't call it a scam if someone actually did a decent job of collecting free material into books as long as they actually, you know, ran a decent business and let buyers know what they were doing.