I suspect that's in large part due to their interconnectedness with the European Union. Neither are Schengen countries, or Eurozone countries, but they both participate in the Single Market - and Norway is a full participant in the EEA. [1,2]
Roughly speaking they coordinate on all major rules and policies and practices with the entire rest of the EU and therefore are effectively part of the EU for regulatory and trade purposes.
The UK on the other hand, obviously just wrapped up its Seppuku process of leaving the EU, and we're already seeing the relative increase in their being taken advantage of by corporate interests due to their much weaker position.
Switzerland and Norway take advantage of the power of the EU to push back on corporate interests, and the UK is getting kicked around as its negotiating power just went down by a factor of 10.
