UNTIL RECENTLY Elon Musk had little must look over his shoulder. He as soon as described competitors for Tesla, his electric-vehicle (EV) firm, as “the large flood of gasoline automobiles pouring out of the world’s factories every single day”, quite than the “small trickle” of different EV-makers. SpaceX, his rocket agency, had so undercut and outwitted the bloated aerospace incumbents that it had developed an nearly invincible aura.