By your definition all stocks are ponzi schemes. Stocks are basically 'premined' by total shares outstanding. The float is then sold to investors. The rest is locked up to either insiders or the company treasury. The nice thing about cryptocurrencies is that they generally don't get diluted whereas stocks can issue more shares and dilute their investors if they so choose. Also cryptocurrencies don't have earnings estimates to miss. If your stock misses its earnings estimate then it generally gets whammed.
huge difference with stocks.
they are regulated. the gov can pull your corporate charter at any time and kill the company. that gives a measure of stability and investor confidence. huge huge difference than crypto where any fly by night can fork a project, change a few lines of code, and have established miners jump on it for the next pump and dump. you cant compare the two
also you are incorrect that cryptos cant get diluted. a coin can offer an infinite amount 'colored' versions of itself. or tokens based on the coin (like ethereum erc20). google stock can only be google stock. alt coin can be alt coin-red coin-blue etc edition.
there is no accountability with crypto alts coins (worse with ICOs). you can operate in obscurity and cover your tracks the whole time. and come up with new schemes to generate investor interest. not so with a stock company.