I was on the conference call. He basically said that it was guaranteed by all his assets even if Tesla was somehow to disappear.

Last I heard, Elon Musk was very cash-poor after his two divorces. Most of his money is tied up in equity stakes in SpaceX and Tesla.

So if Tesla fails, then the "personal guarantee" simply turns into SpaceX shares. And SpaceX is a pre-IPO company.

He still didn't have to do that. It's more about signalling his confidence level. I wouldn't bet against Elon.

Some of it is most likely, yes. He's not afraid to fund his own projects, the man has passion

And billions of dollars.