Are Crypto and Blockchain Technology a Ponzi Scheme? What are elements of a Ponzi scheme?

Dr Kidwell, physician, business owner, and investor of 25 years
Does Crypto or Blockchain Technology have the elements of a Ponzi Scheme:
Ran by a fraudster or group of fraudsters
Promise of huge returns
Lack of a money making enterprise
The Fraudsters are secretly taking profits
Lack of Transparency

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