Great comment and I agree with all of it except you're describing an expanded starlink rather than "datacenters in space". There are definitely workloads that benefit from being in space but that's different from being an economical place to put a rack of H200s doing training or inference.

Dissipating that much heat in the first place would be a first, you also need a butt ton of power so maybe you can shade your giant radiators with giant solar panels, but all of this needs to unfold from something launch-packaged.... AND be cheaper than just plugging them in on earth.