While this outcome isn't best for the economy, it is a good solution for the environment, and perhaps that was the goal of the Netherlands.
The datacente will then create revenue through services and add jobs. Jobs wont be just employees, you're going to have security, shipping, power plant jobs, recycling servers, etc.
It also seems that they'll get some energy from datacenter heat back plus greenhouse heat... so a nice opportunity to do research and create bleeding edge facilities.
It's also credits, as in Microsoft first invests and then gets free electricity for a while...
Then there's a nice national security benefit having datacenter in your country.
So overall a good deal...