My understanding is that local governments often get more in tax revenue than they spend on additional services. Which explains why they want to do it. Example:

https://wjla.com/news/local/loudoun-county-virginia-taxes-da...

> In January, Loudoun County estimated about $895 million in data center real and personal property tax revenue, and the county’s entire operating budget was projected to be $940 million, according to County Supervisor Mike Turner (D-Ashburn).

> Loudoun County’s next budget will spend $4.7 billion in the next fiscal year which includes funding for LCPS, according to the county.

…

> Loudoun County Public Schools will be getting $111.8 million more than last year, and county employee compensation will increase, according to the county.

They’re getting lots of money from data centers and spending it on things like employees and schools, while lowering residents’ taxes slightly.

Apparently you believe differently but where did you learn that?

They have built something like 34 schools, public transit, all kind of projects. It's all in political approach as to how tax windfalls get spent. Here they plan to credit homestead tax bills, eventually down to $0.