>>g-mork+(OP)
Just a neat bit of financial engineering. You can tell because Elon picked SpaceX instead of Tesla – which would have actually made sense at some level (Optimus Robots + AI). But Tesla is public and so he'd need to follow laws and reporting requirements.
>>broken+D9
I guess the difference is Tesla is a public company, so requires more paperwork. SpaceX isn't public yet, but will be soon, meaning it will have a cash infusion.