Dustin Moskovitz isn't on the board but gave OpenAI the $30M in funding via his non-profit Open Philantopy [0]
Tasha McCauley was probably brought in due to the Singularity University/Kurziwel types who were at OpenAI in the beginning. She was also in the Open Philanthropy space.
Helen Toner was probably brought in due to her past work at Open Philanthropy - a Dustin Moskovitz funded non-profit working on building OpenAI type initiatives, and was also close to Sam Altman. They also gave OpenAI the initial $30M [0]
Essentially, this is a Donor versus Investor battle. The donors aren't gunna make money of OpenAI's commercial endeavors that began in 2019.
It's similar to Elon Musk's annoyance at OpenAI going commercial even though he donated millions.
[0] - https://www.openphilanthropy.org/grants/openai-general-suppo...