If a market crashes then it doesn't make it a PONZI.Bitcoin had reasons to fall, which caused some panic sell.Just like what happens in the stock market, when something bad happens with a company; the stock crashes.Does that make the stock market a ponzi too?
Bitcoin has its value in the technology and the service it offers.It ain't a ponzi.

Every time it falls, there are people(like you), who being to call it a ponzi and predicts it price falling to shit.But it always rises back.BITCOIN FTW!