[dragontamer]

Company sells stock.

The money builds a new factory. Or in the case of Google, a data center, or other such item that allows the company to make more money.

Later, when the company is worth more, the shareholder sells the stock back and/or gets a dividend (aka, a slice of the profits).

Everyone wins.

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In contrast, the BTC you bought was likely made using stolen electricity. So we're already negative sum to the start.

[doorman2]

The same thing could happen with crypto. A smart contract developer sells crypto to fund development of a smart contract. That smart contract can provide new utility and drive demand for the currency.