Sam Altman Was Fired from OpenAI
He was fired by the board and there is little information on what exactly happened. Microsoft own a 49% stake in OpenAI. That is something to keep in mind. That is not to say that Microsoft wanted this to happen. I'm only laying out the important pieces of information.
there is possibility that Microsoft might be involved in this
We cannot rule out the possibility. Microsoft own 49% + 75% of profits until it recoup the original investment. The board decided to fire Sam Altman. Either everyone except Microsoft worked together or Microsoft worked with few or one small stakeholder.