When it's bad Elon did it personally and when it's good he had nothing to do with it.
No... If it's actual tech, Elon had nothing to do with it because he's a fucking idiot that's never actually created anything of value. He's not an engineer, he's a guy with a shit load of money that made a couple smart investments early on.
He had no role in the development of PayPal.
He didn't even "start" Tesla, he bought enough shares to get control and became CEO years after the company was created by Martin Eberhard and Marc Tarpenning.
Dude does nothing but take credit for the work of actual engineers.