Microsoft has relinquished its observer seat on OpenAI's board, valued at $13 billion, amidst intensifying antitrust scrutiny of Big Tech's involvement in AI. This move comes as regulators in Europe and the US raise concerns about tech giants' investments in AI startups. Apple, expected to join as an observer, has also opted out, signaling the pressure faced by major tech companies. Microsoft cited OpenAI's progress and confidence in its direction as reasons for stepping back from its observer role, emphasizing the evolving dynamics within the company's governance and partnerships.