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.
Another factor to consider: If AGI is 30+ years away, we're likely to have another "AI winter". Saving money to donate during that winter has some value.