There used to be a lot more of that, but a system was put in place where you have to identify yourself with electronic ID to access the information, and the information is logged so the other party can see it.

Nowadays I think mostly journalists use it to pull up information about politicians and other people that are in the public spotlight. There are of course the yearly "richest people in Norway" lists in various categories.

What is the harm in this case? Shit people are shit even without information. They would be snark about something else then.

Making snark comments about that sounds very unlikely. More likely they'd have respect for someone living frugally and not showing off. See https://en.wikipedia.org/wiki/Law_of_Jante

Yes and no. You get notified if someone else actually asks for your revenue info and so in practice nobody actually does it.

Yep, that tracks.

There's also the underlying current of Jantelagen (Law of Jante) https://en.wikipedia.org/wiki/Law_of_Jante

> How do they handle identity thefts

By just accepting it as a normal fact of life that you will have some random stuff ordered in your name sooner or later with an invoice you'll have to dispute. Happened to a relative of mine, police do not care unless they order things above a certain value, without a police report you cannot get free ID protection, and then you'll have to sit for a long time in phone queues trying to cancel a subscription for a streaming service or whatever they ordered while get thrown around by support reps who go "you SURE you or someone in your family didn't order this?"

The root cause of identity theft in USA and some other places is the lack of "proper" national identity and the associated use of various personal "secrets" (not that secret) for identity verification because there are no good easy other ways.

Businesses in Scandinavia and many other countries would not treat someone knowing your personal information as any evidence of identity (because it's not); having all that information is not sufficient to impersonate you there - identity theft does happen but it would require stealing or forging physical documents or actual credentials to things like bank accounts; knowing all of what your mother or spouse would know is not enough to e.g. get credit or get valuable goods in your name.

It's just a unique ID of a person, it's not a password. I don't see how you can be confused by this.

Just a few years ago this was about to change in Sweden.

But they didn't change it, because "women should be able to look up the men that they date".