He resigns so he would forfeit much of contractual severance in most cases. A negotiated settlement is likely as part of the resignation and if he’s rehired elsewhere (eg at terafab or tsmc) it will generally terminate ongoing payments, healthcare, access to private aircraft and security.
He co-owns ~800mn shares in the company with his wife, so losing severance isn't going to be much of an issue to him.
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oh 6 months or whatever at Terafab then succeeding Musk after he's kicked out would be funny to watch