How in god’s green earth do you arrive at this conclusion.

I’m convinced having read the comments here that nobody actually knows what a Ponzi is.

In practice, most currencies are inflationary because more money is continuously being made. Which means that early obtainers of money actually lose value holding it, instead of gaining more. So currencies would be the opposite of a Ponzi.

On the other hand, the current economy model which relies on continuous growth, might reasonably fit some definitions of a Ponzi.

to the extent that they involve dishonesty/fraud, yes.

Arguably, when monetary supply increases are publicized, then there is no dishonesty, so not a ponzi scheme.

They have another component though: legal tender laws that force people to accept them for debts, and capital gains laws on other assets that give them an unfair advantage.

So ponzi or not -- probably not what the free market would choose in the absence of such laws.

but almost no-one actually uses bitcoin as a currency