I don't understand what point you're trying to make. Yes Microsoft uses OpenAI APIs. What is the point you're trying to make beyond that? It's still OpenAI software.
No wonder why CEO got fired.
Actually the exodus of talent from OpenAI may turn out to be beneficial for the development of AI by increasing competition - however it will certainly go against the stated goal of the board for firing Altman, which was basically keeping the development under control.