Ponzi schemes are financial frauds where, under the promise of high profits, users put their money, recovering their investment and interests only if enough users after them continue to invest money.
Further to this, its qualatively provable, as you can look at the contracts and actually class the type of Ponzi scheme they are.
* https://ftalphaville.ft.com/2017/06/01/2189634/its-not-just-... https://stratechery.com/2017/tulips-myths-and-cryptocurrenci... * https://arxiv.org/pdf/1703.03779.pdf
