AFAIK Svalbard is weird in both immigration laws and a distinct tax structure from Norway. My guess is it has to do with tax avoidance schemes rather than consumption.
Svalbard's legal status is deeply weird. It's administered by Norway, but not subject to a lot of Norwegian law, and people from all Svalbard Treaty signatories including the US can legally rock up and work and stay as long as they like.
https://en.wikipedia.org/wiki/Svalbard_Treaty