>In countries like Norway, that kind of data is publicly available. It makes for less second-guessing and less suspiciousness.

Given that one strategy for businesses is to optimize monetary intake by tailoring prices to how much specific customers can pay and often this tailoring is facilitated by stuff like checking if you are using an iphone or an android phone etc. etc. - if you use your name and address to login to a service and you are from Norway could they look up how much money you make and more precisely tailor their prices for what you are able to pay?

If so, boy, that letting people know exactly how much money you have thing is great.