Agreed, even the best open source projects, like Linux or Firefox, in their wonderful success, didn't render proprietary competition unable to have there piece of the market share.

And even in markets with very dominant free offers like video consumption, programming languages or VCS, you can still make tons of money by providing a service around it. E.G: github, netflix, etc.

OpenAI has a good product, a good team, a good brand and a good moving speed.

Selling them short is a bit premature.