Numerous people (Matt Levine, etc) smarter than me have written about how there was no $1B break up fee. That fee only came into play if something prevented the deal, like regulators blocking it. Him having buyer's remorse was not sufficient to trigger that clause.
This is true, but he could have negotiated a breakup fee with Twitter if he'd wanted to. The board likely would have been more than happy to take $10B from him to kill the deal, which would have saved him a bunch of cash and headache in the long run. But obviously cutting losses isn't how Elon likes to roll; he'd rather burn the company down out of spite.
