Genuinely: regulation. Every other benefit is conceptual at best. If SpaceX controls the entire heavy launch market _and_ they control data-centers in space, then absolutely no one on earth is in a position to control or regulate such a data-center except SpaceX themselves.
I'm not arguing that it's a good idea, but that is the idea.
It's a convenient way to merge AI and spacetech, two hot topics to the retared investor class that rules our world. The reality and feasibility of it doesn't matter.
I'm not arguing that it's a good idea, but that is the idea.