I wonder if Elon wants to tangle all his businesses into SpaceX so they are all kept afloat by SpaceX's importance.
I've heard this a lot, but I've worked for BigCos and it seems like all they do is spend money, often superfluously. I've seen BigCos spend large quantities money on support contracts every year that haven't been used in more than a decade, or sending people on business trips across the country so they can dial into a meeting, or buying loads of equipment that sits dormant in warehouses for years and then is eventually sold off for pennies on the dollar.
I'm not convinced that they're better than the government with money allocation, I think they're just better at telling people they are.