> But it's not less in local coffers.

The local government is giving a local tax break, which comes out of their local tax revenue.

> If the incentive was not given, the datacenter would not be built there.

Objection, your honor, assuming facts not in evidence!

(Nor are the incentives any sort of guarantee. https://www.cnbc.com/2021/04/21/foxconn-mostly-abandons-10-b...)

> Residents aren't paying more for anything and no services are being cut.

They are receiving less tax revenue than they would have otherwise had to use on their services.