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I think you're greatly exaggerating. Deep ocean is a much more hostile and inaccessible location than LEO by almost any possible metric I can think of except, possibly, the energy cost of reaching it. The Moon is much further away, requires much more Δv, and isn't even sunny for half the time. Antarctica is extremely energy-poor and is unavailable for commercialization in any case.
At 400K, your panels should be able to reject over 1KW per m² to deep space, continuously. That's actually pretty efficient! You can do better with air cooling of course, so long as you don't care about environment heating at all, but that's also at some energy cost.
Dirtside computing can be infinitely painful, depending how uncooperative governments want to be with regulations and lawsuits. At least in LEO there's limited jurisdiction.
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