Interested in the question, I browsed the web and figured out that most sites make money on naïve fools, tricking them out of money.
How do they do it? Easily!
Almost every site promises a wondrous deposit which can double the sum you put on it.
Nonsense, isn’t it? But some people believe it.
The World Wide Web is full of such swindles. They are upgraded and tuned, the new ones being invented and the old ones being reused. It all happens because of people’s thirst for easy money and their reluctance to work.