See https://www.ic.unicamp.br/~stolfi/bitcoin/2020-12-31-bitcoin...
Yes, you are wrong. The US dollar is not a ponzi. To quote from the Bitcoin is a Ponzi article:
National currencies too fail to fit the definition, because people do not "invest" in them with the expectation of gain. In fact, governments make their currencies slightly inflationary precisely to discourage hoarding.