But does he? Tesla was started by other people. Under him they announced self driving cars, which are little more that upgraded cruise control. Use it for anything else and you are asking for a collision. He announced electric trucks, which never materialized. SpaceX had big asperations, but is not going anywhere, and no where near profitable. Plus all his other vaporware projects.
It's like all his big plans are looking into old sci-fi stories, says they are going to make that, get money from investors, and when the project stalls because of reality he moves onto the next big thing that they will have available in "2 years".