So it's one thing to imagine you're a programmer who does a small amount of contracting on the side; now imagine you're a teacher who does some "mild" sex work (say, solo camming): the social and financial repercussions on them having their second job disclosed is a real risk. Even from the employer's point-of-view, it's a risk to their reputation for hiring such a person (there again, such a thing seems unlikely to be considered good enough reason to dismiss someone outside of their probationary period in Norway).