First Microsoft, now Apple: Sam Altman keeps breaking up with Big Tech.

OpenAI CEO Sam Altman has struck big deals with Microsoft and Apple. Both of them have ended poorly. Kevin Dietsch/Getty Images OpenAI has struck important deals with Microsoft and Apple over the last couple years. But Microsoft and OpenAI have more or less called it quits. And Apple is suing OpenAI. These aren't the first Big Tech deals to go south. But these are two high-profile breakups in the same year. Coincidence or trend? A year ago, OpenAI seemed like it had an untouchable lead in the…