Some of it is useful, and from an environmental perspective, if it eliminates some other activity (e.g. team of workers driving to/from work and their office heating/cooling) then it can even be a net positive.

I would agree that there should be some tariffed token usage based on CO2, efficient datacentres pay little, polluting ones pay a lot - would help even the field and export good practice.

Except you don't actually ban it, you just move it to texas.

That content is coming either way.

And if you require them to over offset their load to the grid, it's literally fossil fuels burned over all.

Datacenter wouldn't stop, and there would be some country or area which allows it. Unless they regulate the entire world, we should focus on lowering CO2 globally, and that means allowing datacenter in your neighour if your energy is better.