That’s not what a Ponzi scheme is. In a Ponzi, earlier investors are paid from what newer investors put in. While there have been Ponzi schemes that used Bitcoin or Ethereum or what-the-fuck-ever, they themselves aren’t Ponzis – they’re essentially commodities. They’re stupid, wasteful commodities, but what else is new?
With your definition, stocks and commodities are Ponzi schemes too. It’s clearly nonsense.
And no, before anybody starts getting any ideas, in case it’s not already blindingly obvious I’m not a “crypto fan” by any means. There’s some technologies and ideas there that might be useful in the long run, but 99% of the field is bullshit