I think you actually mean 'puzzle scheme'
You sound very puzzled

Ponzi scheme has a very specific structure and what we're seeing here, especially the appreciation and depreciation cycle of the BTC as an element of valuation and tradeability itself, makes BTC an element that COULD be part of a ponzi scheme the same way that fiat can, but no different than fiat in that regard.
Very different than fiat because of the debasement rate relative to the market cap.
This is why we are seeing $1 billion valuation expectations.
That's another issue, and yes you're correct in pulling a non-parallel between BTC and fiat with relativity to market cap. My point is regarding BTC as a ponzi scheme; BTC is not a ponzi scheme though ponzi schemes can use BTC, just as they can use fiat and in *that* sense they are the same. I am limiting my comment of similarity only to that aspect and for the sake of the point that the subject addresses, nothing more.