Earlier quoted context omitted.
An exchange that manipulates it's market to hide away losses and try to shore up it's balances starts to look a lot like a ponzi scheme after awhile.
Only given an unacceptably broad interpretation of the word "Ponzi." Fraud is the one you're looking for.
The low BTC exchange rates were both indicative of the risk, but also enticing to new exchange customers trying to strike it rich off a sinking ship.