Technology giants Microsoft (MSFT) and Apple (AAPL) have each given up their board seats at privately held OpenAI amid growing regulatory scrutiny of artificial intelligence (A.I.).Microsoft, which has invested $13 billion U.S. in OpenAI, had a non-voting observer seat on OpenAI’s board of directors, which it has now rescinded. Apple was to take up a similar role on OpenAI’s board but has decided against the move.The departures of Microsoft and Apple mean that OpenAI, the company behind the ChatGPT chatbot, will have no observers on its board moving forward. The decisions by Microsoft and…