There is a difference between the product being a way to fund the research and the direction being driven by the product. If OpenAI ends up like a Google Brain

There is a difference between the product being a way to fund the research and the direction being driven by the product. If OpenAI ends up like a Google Brain, that doesn't mean Microsoft calls the shots, because Microsoft doesn't own any of the IP or researchers. Microsoft just has a a license to something that is almost certainly contingent on funding, and as long as the research is good, others will be happy to take their place.