https://www.theverge.com/2023/3/24/23654701/openai-elon-musk...
I don't think Elon Musk has a case or holds the moral high ground. It sounds like he's just pissed he committed a colossal error of analysis and is now trying to rewrite history to hide his screwups.
That would be nice outcome, regardless of original intention. (Revenge or charity)
Edit: after a but of thinking, more realistically, threat to open sourcing gpt4 is a leverage, that musk will use for other purposes (e.g. Shares in for profit part)