"By that definition, stocks too are ponzis. No. Stocks have an external source of revenue, namely the profit that the company makes by selling its products and services to customers..." This is a very simplistic view of equities markets and does not explain penny stocks, meme stocks (GME/AMC), TSLA, and other things that seem to escape traditional fundamental analyses.
Tesla unfortunately undermines your argument. Has it been hyped to the moon? Definitely. Is there a good chance people will lose a lot of money on it? That too. But they make actual cars that get actual people actual places. That is the kind of actual value creation that underlies most stocks.