At least one of them must jointly make this decision with the three outside board members. I’d say it’s more likely to be business related. (In addition, the CTO is appointed as the interim CEO.) (Edit: But obviously we currently don’t really know. I think the whistleblower theory below is possible too.)
The announcement: https://openai.com/blog/openai-announces-leadership-transiti...
“OpenAI’s board of directors consists of OpenAI chief scientist Ilya Sutskever, independent directors Quora CEO Adam D’Angelo, technology entrepreneur Tasha McCauley, and Georgetown Center for Security and Emerging Technology’s Helen Toner. …..
As a part of this transition, Greg Brockman will be stepping down as chairman of the board and will remain in his role at the company, reporting to the CEO.“
Previous members: https://openai.com/our-structure
“Our board OpenAI is governed by the board of the OpenAI Nonprofit, comprised of OpenAI Global, LLC employees Greg Brockman (Chairman & President), Ilya Sutskever (Chief Scientist), and Sam Altman (CEO), and non-employees Adam D’Angelo, Tasha McCauley, Helen Toner.”