From their site:
OpenAI is a non-profit artificial intelligence research company. Our goal is to advance digital intelligence in the way that is most likely to benefit humanity as a whole, unconstrained by a need to generate financial return.
The money quote is at the end, literally—$1B in committed funding from some of the usual suspects.
Yeah the best argument I can think of for this course is something like: soft takeoff is more likely, and even if hard takeoff is a possibility, preparing for hard takeoff is so terrifically difficult that it doesn't make sense to even try. So let's optimize for the scenario where soft takeoff is what happens.