So many people just love to use words like ponzi scheme and pyramid scheme, but really dont know what they talking about, no way Gox was a ponzi scheme.
A ponzi scheme is where a scammer pretends to have some super profitable investment scheme and promises poeple huge profits if they buy a share in his company or bonds or investment fund or whatever, while in fact all he is doing is paying the old investors with the money coming in from new investors and when the moment comes he can not find any more new investors the whole thing will just collapse like any pyramid scheme.
How does this resemble anything GOX did ? It does not
Gox might have been scamming people, but it they were it was the most simple scam, just take your money and run, but chances are they were just incompetent, first with how they dealt with financial regulators and then how they dealt with the transaction malleability issue.