I live in Norway and have never seen a .nu domain.
I can't remember when I last saw a .nu domain advertised recently, they seem on the way out. But it seems business domains in general are also disappearing in favor of Facebook pages or Instagram accounts.
I don't feel we in Norway did that a lot. There were some restrictions on .no, but mainly that you needed to be an organization of some sorts, which was fairly easy to do if you just wanted (could make a dormant single person company). Those not bothering just used .com