By now, I'm pretty confident that some people would keep screeching "it's just a marketing stunt, AI capabilities and AI risks aren't real, they're just doing this to prop up their stocks" even if they find a Cyberdyne Systems T-800 armed with a shotgun breaking down their front door. "It's a marketing stunt" is just denial trying to look like it's being clever.
I think you are conflating skepticism about AI companies' motives with skepticism about their capabilities. Even if OpenAI is being 100% honest in their reporting on this it's still good marketing for them. The fact that this outcome is good for their business and stock price makes me suspicious about how much this was a complete accident vs an "accident" that they allowed to happen by setting up the right environmen…
You state this as fact--how do you know it? OpenAI isn't publicly traded. On Hiive OpenAI is marginally down in July: https://www.hiive.com/securities/openai-stock