But that doesn't matter, because functionally, there is no difference between an intentional Ponzi scheme and Bitcoin.
Bitcoin trading is a negative-sum game. All winning that anyone gets comes out of the pockets of newer investors. There is no net inflow of value or money that could cover the gains people make trading, other than the money being put in by other people. There is a net outflow of money, in the form of trading and mining fees, but there is no inflow.
So functionally, with Bitcoin, old entrants are paid off with the money invested by newer entrants. This is exactly how a Ponzi scheme works.
Again, it may not be intentional, but it works the same nonetheless.