If it make you feel better, they could do it all with one closed loop and just use the ground as the sink.

I don't how that should make me feel any better 😀 . But I don't know if ground is a good enough sink for that.

They could then power it entirely off solar panels and Iron air or sodium batteries.

I don't think they're going to consider renewables for cooling alone when the entire operation needs enormous amounts of power that cannot be satisfied by renewables.

They’d cool their servers with the blood of children if it saved them money.

Amen to that! Like I said - perverse incentives.