All currencies, including crypto, fiat, and chickens, have been Ponzi schemes since the beginning of time and will continue to be until the end of time. It's fundamental to their nature.
When the state does it, it's not ponzi until the state implodes and then it is.
Currencies lack the suggestion that holding them will bring you a profit. That isn't true of chickens, which are significantly better in investment terms than currency - holding chickens definitely will bring you a profit, unless you screw it up.