Amazon sought to hide the water use of its data centers from the public, for fear of looking bad:

"Instead, Amazon officials opted to use only the relatively smaller figure of primary use, 7.7 billion gallons, when calculating progress towards its target because of “reputational risk”, fearing bad publicity if the full scale of Amazon’s consumption was revealed, the document shows."

https://www.source-material.org/amazon-leak-reveals-true-data-centres-water-usage-secret-plan/