Yes I am fully aware of the registration trick, it's the same in the uk, when you register your car you get a form back that says you are the registered keeper, not owner, this gives them the right to tow "their" car whenever they see fit, this is the same when you register the birth of your child.
I think it's different in Sweden, without your number that they give you at birth you can't do anything in this country.
But then if everyone did it then the government wouldn't have a leg to stand on.