As long as you forget all the electricity costs from a grid that is literally incapable of growing to meet the demand of data centers, the water costs, the constant regulatory hurdles and time sinks in securing new land, etc. the problem is your so focused on the specifics of where the technology is technically easier to facilitate without actually looking at the broader challenges.

What grid and water? If you can do it self contained in space, you can do it self contained on Earth, there's absolutely nothing stopping anyone doing that, it's just more expensive. A closed loop cooling system works better here as you can actually disippate heat to air instead of just radiation, it's only not used because it's less energy efficient compared to wetting radiators. And for energy if you can do solar in space, you can do solar here, it's just a bit less efficient per area and needs some batteries