Long story short --- it's a cult --- there is no logical way to explain it.

Musk is the leader selling his own brand of fantasy that he makes up as he goes along. A lot (if not most) of what he says never comes to pass but people still cling to every prognostication as if it is gospel.

For over two decades, he was all about taking over the auto business with full self driving EVs. Obviously never happened. So now he is off to take over ride sharing and robots and AI and whatever else comes down the pike tomorrow.