Capitalism doesn't automatically equate to greed
Capitalism is about allocating capital. If the datacentres flock to your local water source and gobble it all up, it means the water is too cheap. Of course, making the water hella spendy for everyone isn't popular either. But maybe selling water for evaporation should have a different tariff than selling water for domestic use, where it comes back through the sewer system.
I'm quite sure you can employ all sorts of tricks, like painting the bit barn superwhite, adding PV on the roof, and so on, to keep energy and water use down. So find incentives for bit barn owners to go and use them, too. (Whatever happened to that "park a computing thingy in your basement, get free space heating" initiative?) Or you can try and find synergies, despite that being a horribly overused idiot management buzzword by now.
One feature of this latest AI hype is that it needs most of its number crunching to go through all that data and build the model, which isn't latency sensitive. Meaning you can park the bit barn wherever you want to, and it doesn't have to be just for the cost of 'leccy and water. So you could, oh, park an evaporatively cooled datacentre in your newly planted regreening project in the desert in hopes of helping it rain more there. You'd need to bring the water, probably sea water and deal with the salt somehow. (Get it out first. Then sell it? Build molten salt batteries with it? Something useful, please.) But at least it'd be "dual use", number crunching AND regreening. Now for some computational ecologists to do a bit of modelling to see if that idea could possibly fly, and if so in what circumstances. (What, that's people meddling in the environment? Yes, yes it is. Consider that IIRC the Sahara got enlarged a good bit because humans started to keep goats there. Goats eat everything, so no more plants to keep the sand in check.)
It's been said that good rulers never do anything for just a single reason. It seems such rulers are a tad scarce.