[chancitag]

It is much more difficult than that. Starlink is essentially IT infrastructure, which certainly produces heat but nothing on the level of pure compute. Ejecting heat in space is a difficult problem that is currently solved on the ISS with large IR radiators which take up weight and space. The size, weight, power, cost tradeoffs lean heavily in favor of ground-based compute.

[dlcarrier]

The ISS dedicates more space to solar panels than radiators, despite the occupants having a very tight temperature requirement, which is about 20% cooler than the max most semiconductors can indefinitely run at. Just putting the radiator on the surface of the satellite might be enough, without even needing a panel.

Even if a heat radiator as large as a solar panel is needed, it'd be only a small portion of the overall cost.

Radiating waste heat on earth is a much more substantial portion of the total cost, especially so considering the social backlash it creates.