I agree with your main point, but I want to clarify that OpenAI never promised open source. This is a pernicious misunderstanding that OpenAI has been all too happy to leave uncorrected. Open source was never part of the mission, and I can't find any place where OpenAI leadership has implied that it is or will be.
From 2016:
> They’d raised a billion dollars and hired an impressive team of thirty researchers—but what for? “There are twenty to thirty people in the field, including Nick Bostrom and the Wikipedia article,” Amodei said, “who are saying that the goal of OpenAI is to build a friendly A.I. and then release its source code into the world.”
> “We don’t plan to release all of our source code,” Altman said. “But let’s please not try to correct that. That usually only makes it worse.”
Source: https://www.newyorker.com/magazine/2016/10/10/sam-altmans-ma...