That said, this is really about the principal. Sure, if I give you $10 and you give me a hamburger it's not like some illegal transaction. But to say the $10 comes from thin air is wrong. It doesn't come from thin air.

I would bet that if one day OpenAI decided to sell 10% of AMD the stock would crash from $600 to below $150. IIUC, there's 1.6B shares of AMD while only 54M shares trade daily so dumping 160M shares would tank their price [1]. If AMD gives OpenAI 10% of the company and OpenAI goes under, it's going to take AMD's share price with it.

[1]: https://www.marketwatch.com/investing/stock/amd