Or potentially:

C) SpaceX engineers enjoy their cushy salary funded by a guy who won't take "that doesn't make sense" for an answer to work on rockets and neat technology, even if it may never really work out.

Do you know anyone that works at SpaceX? They get paid well, yes, but my friends who work there say they work you really hard. The bet that's being made is that there will be advancements in materials science that make data centers in space viable. If you hypothesize that there's a way to cool things down in space if you just had the right material to do it, it makes sense. Starlink satellites are already compute plus solar panels. Just scale it up! Or course "just" is doing a lot of work here, but that's the theory.

That's a different conspiracy theory, for which there is also no evidence.