It would be different, maybe, if everybody else in the industry stood aside and let OpenAI monopolize development of transformer-style-AI (or whatever it is we're calling this) for the common good. But nobody did that; the opposite thing happened. This space has been a Gem Saloon knife fight just waiting to pop off for the entirety of OpenAI's existance.
How is this different than, “I read a scientific paper, and unlocked millions of dollars of value, and all it cost was $250 for 8 pages of text. So I guess Axel-Springer is a public good.”?
Just buying and selling something doesn’t make it a public good. Valuable sure, but selling something for a profit makes it by definition not a public good.