Not buying it. In the end, OpenAI will throw these people under the bus and settle out.

I think you're right, but let's not forget that Apple's goal isn't to protect themselves or to get a fat payout here. Their goal is to make their current employees less likely to leave for an offer at a company like OpenAI. This suit is telling everyone Apple employs "Hey, if you leave and we can find anything that looks a bit dubious, we're happy to screw you over."

Apple aren't a loving and caring company that nurtures people. They're as ruthless as the next trillion-dollar unicorn.