Here's an indictment from 2019 for similar activities. It's a crime in the U.S., thus prosecutable in the U.S. The question is whether Swiss authorities cooperate, not the jurisdiction.
The jurisdiction is quite questionable. If someone in north Korea would decide I'm guilty of breaking some bizarre law, I couldn't care less. Why would a Swiss citizen care about what the united states think is a crime?
It's easier to get extradited to the US than to North Korea
In fact I don't think any countries will extradite you to North Korea. There's plenty (including many in the neighborhood of Switzerland) that extradite to the US for at least some crimes.