Here's an idea. A pie in the sky idea!
What is SpaceX's starship good for? Well, what does space have? Solar power in gobs.
A lot of the economic barriers for space based stuff is just moving stuff around and getting it back to earth. Well, for computation you don't have to do that. You just beam the answers back.
Starlink has the networking substrate already. With the end of exponential churn in hardware, soon orbiting computing can have a longer lifecycle.
Starship is targetting 10$/kilogram. You can fit a computer in a kg easily. The launch cost will be a fraction of the procurement and other lifetime costs of the computer.
I guess cooling is the other issue. I don't know much about cooling in space. I know it is REALLY HOT on the sun side, and REALLY COLD on the other, but radiating heat usually involves other molecules touching the hot thing. Maybe you put reflective paint on the computing unit to keep the sun out, and the cold side chills the rest of the computer to near-absolute zero? Again, I am clueless about space heat dissipation.
But if you can ALSO get really cold temperatures, you can also overclock the CPUs to run faster and get more compute.