[kbenson]

Because in some respects it's not a theory, it's his own explanation for why he does certain things. The extrapolation to how it applies to new ventures is theory, but it doesn't obviously make little sense. It doesn't even need to be realistic, all that has to be true for the theory to be true is that Musk believes it, as it's an explanation of his behavior.

[pavelrub]

Musk has never used Mars as an explanation for any of his non-SpaceX ventures. His own explanations for why he got involved with Tesla, started The Boring Company, or invented the Hyperloop have nothing to do with Mars or space.