Sam Altman, chief executive officer of OpenAI, during a fireside chat organized by Softbank Ventures Asia in Seoul, South Korea, on Friday, June 9, 2023. SeongJoon Cho | Bloomberg | Getty ImagesOpenAI on Monday announced it had closed what amounts to the largest private tech funding round on record.The $40 billion financing values the ChatGPT maker at $300 billion, including the fresh capital. It's nearly three times the amount previously raised by a private tech company, according to PitchBook....