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has anyone figured out how to cool those space datacenters yet?

Yes, we know exactly how to do this: radiators. We do this on all satellites that produce a lot of heat, including the ISS, and Starlink. The only question is if this is financially viable for AI datacenters.

My point is, given the risks, why are we even doing this? It could be financially nonviable, but with enough investment, we could still create a really bad situation.

You would need radiators that are like hundreds of miles wide to cool a data center in space.

These are each much smaller nodes. It's not like launching a whole terrestrial DC as one satellite. In any case, it's just a matter of financial viability. It's not a physics issue.

You know what can push "not financially viable" into something that exists? Many billions of dollars of investment.

Duh, it's so obvious. With water from the moon! Or even better, dumping them in Uranus! /s

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