OpenAI CEO Sam Altman speaks during the Microsoft Build conference at Microsoft headquarters in Redmond, Washington, on May 21, 2024. Jason Redmond | AFP | Getty ImagesOpenAI has reversed its policies towards secondary share sales, and will now allow current and former employees to participate equally in annual tender offers, CNBC has learned.The artificial intelligence startup has taken a restrictive approach in the past, with rules allowing the company to determine who gets to participate in s...