Clean drinking water is actually de facto a finite resource. It does recycle through nature, but large reservoirs and water tables are slow to recharge, often taking millennia to form, so there’s a lossiness in that sense — our usage and loss of potable water can’t be higher than the overall recharge rate. So it’s something we could exhaust without big technical breakthroughs (converting salt water quicker than nature does in large quantities, etc). We rely on maintaining a sustainable rate of consumption to avoid setting up future generations for potential catastrophe, basically. Not saying data centre water usage could alone be the difference, but it’s not implausible if it increases exponentially. Another factor is existing reserves can be contaminated and made undrinkable, adding an unpredictable factor into calculations. It’s an interesting topic to read about.