So, what’s a guy got to do to become a billionaire around here? Greg Brockman scribbled the question in his diary, recently unsealed as trial evidence, just two years after co-founding OpenAI as a charity in 2015: “Financially, what will take me to $1B?” For Brockman, now OpenAI’s president, the answer was a yearslong restructuring saga in which OpenAI metamorphosed from a nonprofit research lab into a corporate behemoth on the verge of a massive public offering. Elon Musk, another co-founder who left OpenAI in 2018, is suing OpenAI, CEO Sam Altman, and executives like Brockman for this transformation, alleging that he was misled about the company’s profit motives when he donated tens of millions of dollars to it in its early days. Brockman testified on Monday that he was eventually awarded a slice of OpenAI for the “blood, sweat, and tears” — but, notably, not money — he poured into building OpenAI. His portion of the behemoth is now valued at about $30 billion on paper.…