[Kovah]

Well, I would not state that "those people" are immoral or stupid. Even academics or highly moral people fell for these scams. The big problem is that "those people" are blind to the signs of the scam, which seem obvious to people who know the matter - in this case the blockchain and the crypto-world. In case of OneCoin, people were told they could earn some money by simply buying some fancy, technical crypto-thinghy. It's just the human nature to react positively to possible contracts or actions which likely return something positive for them.

This is the same issue for all other "scams", i. e. like some insurance-salespersons, which obviously sell overpriced or needless contracts, just to earn more money with their victims. Or car mechanics who tell the car owner the suspension arm needs to be replaced even if it's in perfect condition. It's always the same: some greedy, immoral people exploiting the inexperience or missing knowledge or other people.