Ocean cooling ?
I would have though the idea of pumping large volumes of cold sea water through the last stage of your cooling system might be better proposition than evaporating large volumes of scarce fresh water.
The datacentre could be away from the seashore (like Fukushima) and even underground. The saltwater open circuit cooling exchanges heat with a closed circuit cooling system which possibly with further stages cools the hardware. The pumping costs might be excessive and dealing with salt water corrosion might be troublesome.
Possibly could be coupled with a desalination plant to utilise the datacentre's waste heat.
My guess is that these big tech geniuses have thought "let's melt Greenland — it is one giant reservoir of cold."
"Hey Donald, we need Greenland."