Microsoft has access to almost everything OpenAI does. And now Altman and Brockman will have that access too.
Meanwhile, I imagine their tenure at MSFT will be short-lived, because hot-shot startup folks don’t really want to work there.
They can stabilize, use OpenAI’s data and models for free, use Microsoft’s GPUs at cost, and start a new company shortly, of which Microsoft will own some large share.
Altman doesn’t need Microsoft’s money - but Microsoft has direct access to OpenAI, which is currently priceless.
MSFT's control isn't as "hard" as you portray it to be. At the senior leadership level they're pretty happy to allow divisions quite a lot of autonomy. Sure there are broad directives like if you support multiple platforms/OSes then the best user experience should be on "our" platform. But that still leaves a lot of room for maneuverability.
Soft control via human resources and company culture is a whole other beast though. There are a lot of people with 20+ years of experience at Microsoft who are happy to jump on job openings for middle-management roles in the "sexy" divisions of the company - the ones which are making headlines and creating new markets. And each one that slides on in brings a lot of the lifelong Microsoft mindset with them.
So yeah working within MS will be a very different experience for Altman, but not necessarily because of an iron grip from above.