Having your exponentially more expensive fleet of satellites constantly burning up versus dedicated cables that rarely need replacing
The big use-case for Starlink is typically for people in locations without dedicated cables.
All energy generated on earth contributes to global warming, even solar panels which decrease Earth's albedo. If you care about climate change and the earth you should want the datacenters to be in space.
The earth is limited in the amount of thermal energy it can radiate.
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