Bezos’s companies do billions of dollars of business with the federal government. The rise of Musk, his long-time rival, could jeopardize that.

At his side has been First Buddy Elon Musk, the billionaire who once said he’d rather “stay out of politics” and then set that side to barnstorm Pennsylvania on Trump’s behalf has settled in nicely and become a central figure in the transition, making himself home at Mar-a-Lago and tweeting up a storm about his new advisory role.