I really am not expecting Apple or Microsoft to discover AGI and ferret it away for profitability purposes. Strictly speaking, I don't think superhuman intelligence even exists in the domain of text generation.
Of course, I agree that Stability AI made Stable Diffusion freely available and they're worth orders of magnitude less than OpenAI. To the point they're struggling to keep the lights on.
But it doesn't necessarily make that much difference whether you openly share the inner technical details. When you've got a motivated and well financed competitor, merely demonstrating a given feature is possible, showing the output and performance and price, might be enough.
If OpenAI adds a feature, who's to say Google and Facebook can't match it even though they can't access the code?
Given how good the model is terms of the quality vs speed tradeoff, they must have something.
I would guess that in that timeline, Google would never have been able to learn about the incredible capabilities of transformer models outside of translation, at least not until much later.
e.g. Almost the entire market relies upon Attention Is All You Need paper detailing transformers, and it would be an entirely different market if Google had held that as a trade secret.