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Apart from heat radiation they have to worry about other satellites, trash and lastly ionising radiation, since they have to put the satellites far wider away than normally.

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Space trash ceases to be an issue in the ultra large scale when self-healing properties exist. We are not at that level of technology, and our technology has no healing capabilities whatsoever, but we can't get there if we don't try.

Well, we also can’t get to Arctic data centers without trying and I’d argue that’s far more likely to be achievable of a goal.

Where's the power source in the Arctic? The sun doesn't shine too strongly there if at all, so solar wouldn't work. Power would have to wired in from thousands of miles away, which is achievable, but that's extra work. Wind could work, but it would require vast batteries to supply a steady load.

Like with mining Bitcoin, the best place is where the power is available and cheapest.

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