[rainsford]

At the very least they take limited land in a community that could instead be used for any number of different things. If they're not taxed, they provide essentially no benefit, economic or otherwise, to the community in which they're located. Basically any other use of the land would provide more localized benefit by providing more jobs, housing, places for residents to shop or things for them to do, etc, all of which benefit the community more than a data center.

Of course data centers aren't just taking up land. They also in many cases produce massive amounts of noise, water and electricity usage, and are visually pretty unappealing to have in your backyard. And there is essentially no upside. Data centers aren't like shopping malls. You might benefit from them existing, but you don't benefit from them existing right next door. If they're not providing at least some tax benefits to the community, I can think of zero reason any community would want them.