Compute in space is doable, we already send plenty of computers up there, technologically, it is not even a challenge. It just doesn't make sense economically, even with Starship, it is making things harder for no good reason.
Starlink is different, it makes sense. Covering the entire Earth, including the oceans with cell towers for global internet connectivity is harder than having a satellite constellation. The opposite situation from datacenters.
how does the economics compare at scale building a persistent 24/7 supply of 1,000 gw isnt easy or cheap
It’s trading political difficulty for engineering difficulty.
There are now quite a few politicians running on a platform of banning data centre construction projects.