Ponzi schemes and pyramid scams require an ever growing number of new suckers for it to work. That is where the problem lies.
Ponzi and Pyramid are two COMPLETELY different things. And in reality BitPonzi is not a true "ponzi" but just modelled on one. A true ponzi does require suckers to work, and is indeed a con. BitPonzi is not, you know exactly what you are getting, and the rounds there are meant
to end, with the payout of a jackpot. It's a gamble, it's good fun, and you risk only what you want. I could go on but I suppose if you don't get it yet, I'd be wasting my time. I guess it's not for everyone.