The threat is: This "datacenter power" disincentives buildout of "free" powerplants (by eating up significant demand at very low margins thanks to basically vertical integration); this slows down buildout of "normal" infrastructure (possibly both grid connectivity and power), and the electrical energy market becomes worse for consumers than it is now.

I personally think all of this is very speculative for now, but allowing industry to rely on the grid (which they still would!) while almost exclusively "buying" their own power is a risky proposition from a consumer perspective.

In a different world they would have earned trust and deserve the benefit of the doubt. This is not that world.

In short, I'm very much in favor of building the right solution to a problem.

I am unsure what cognitively triggered an unhealthy response of "this is NIMBYism!" and would welcome a follow up comment to understand your train of thought.