SpaceX CEO Elon Musk and his rival Sam Altman have both testified at the OpenAI trial, as both companies prepare for massive IPOs amid questions about revenue and earnings. Oh yea, Musk is also the CEO of Tesla, which is facing its own share of scrutiny about an inflated stock price. Meanwhile, Microsoft is trying to quietly walk away from OpenAI after years of partnership, but that won’t keep MSFT CEO Satya Nadella off the witness stand at the OpenAI trial. OpenAI Trial? Why? The Wall Street Journal has a serviceable intro to the trial which it characterizes as “a landmark trial that could potentially upend OpenAI’s future”: Musk has accused OpenAI and Altman, its CEO, of manipulating him into thinking he was donating tens of millions of dollars to help launch a nonprofit to develop artificial intelligence for the benefit of humanity, only to turn it into a for-profit venture.…