What do you mean by "successful"? Able just to simply withdraw or did someone got a decent return?

In the case of a simple just withdrawal, several users able to do it but the majority still got busted even investing early. That's even worst than doing the usual gambling as you are just basically waiting for your return without an assurance.

That's why it's not a recommended way to earn even how risk-taker you are. It's easy to say that people just need to take advantage by investing early but most of the time, ponzi scheme is showing their color even at the early phase of their operation.