I don t think bitcoin is a ponzi scheme per se though it has some aspects of it because bitcoin has no obvious intrinsic value. So one can easily conclude that its value is given by the next buyers, which is ponzi-scheme-like.
However i believe its intrinsic is allowing users to buy cryptos, including nubits and nushares, in the first place.
In case Nu has trouble getting an exchange with a decent volume on NBT/FIAT, Nu will be dependent on BTC for its liquidity, which would be the case at B&C exchange.
It is possible and desirable in the future that exchanges like Coinbase adopt NBT/USD though unlikely at this stage.
However, Bitcoin is certainly not a currency and cannot be by design though they change the way it is issued but that would kill it…
I cannot agree more with the following stances:
So the world needs definitively something like NuBit.
Bu NuBit needs Bitcoin right now.
So I would say the world needs NuBit and Bitcoin.