Even being known as an anti-ponzi fanatic, I don't quite see how this is a scam.
What exactly is Mavrodi claiming that distinguishes this from gambling? He seems to be sprinkling jealousy triggers over his site, but that's not fraudulent in itself, is it? Yes, there is some pretty crazy stuff on the site, but still, read this quote:
All transferred BITCOINS to another participants are your help given by your own good will to another one, absolutely gratis. If you are completely confident and certain in your actions and make your mind to participate, we kindly ask you to study carefully all warnings and instructions first.
And another, REALLY standing out
WARNING!
There are no guarantees and promises! Neither explicit nor implicit.
I don't think Mavrodi will have a hard time sleeping at night if he takes money from people who project their greed onto this kind of thing. This is NOT the same as a typical, criminal Ponzi. At first glance, I'm not quite sure why it should be categorized as a scam instead of gambling.