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OpenAI co-founder Greg Brockman is leaving, too
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think you're just not as familiar with Apple as you think you are. They ousted Jobs very early on and the company subsequently floundered badly. Then they brought him back and then took off like a rocket again to become the monolith they are today (even though he passed some time ago now).
Steve Jobs is the exception. I'm just trying to answer the original question about why this happens so often. I'm not trying to argue about the best way to run a company. But if you're equating every founder with Steve Jobs then we're having a completely different conversation.