Earlier quoted context omitted.
Nothing (except lawyers fees). It was Eberhard who sued Musk trying to get the courts to declare that only he and Tarpenning can be called co-founders of Tesla. And that backfired because the judge declared that, actually, Musk and JB. Straubel are also co-founders of Tesla. https://www.tesla.com/blog/judge-strikes-claim-who-can-be-de...
You can't cite Tesla's blog as a credible source when that specific site still contains blatent lies and falsehoods such as FSD.
If you're curious, pick a few companies at random and dig into their history. You might be surprised by how late some of their "founders" became involved in the business.