Well, I would personally have gained financially if there were more income transparency. My ex claimed that he had NO income and refused to pay me any maintenance for our children after we divorced. He got away with it for fifteen years. I knew very well that he did have an income, because he was able to afford a mortgage, buy and run a car, go on frequent holidays, go out for meals etc etc apart from all the normal bills.
I think I know where his money was squirrelled away, but I could never prove it. HMRC and the CSA wouldn't investigate, because I couldn't hand them any proof and they refused to investigate the person who was, in effect, 'keeping' my ex, claiming it was a confidentiality issue. If I had been able to produce more evidence, maybe the CSA would have done something. The only people who didn't believe him were the council when he tried to claim that he shouldn't pay council tax. He had to go to some kind of hearing, where he was apparently asked to show how he managed to pay his bills. At that stage he backed off, but HMRC and the CSA just took his word for it.
I still don't understand why Norwegians are different.