You can add France and Japan to the list. In France, they don't go door to door, though, it's only a check box on some tax returns forms. In Japan they do come door to door. I've never heard about "detection vans" in either, though.
The worst part is the intercom systems which are standard in every home. Not only do you hear the doorbell and the knock, but they get to broadcast their face directly into your private space! (I have since disabled the camera / audio feed but it spooked me more than a few times!)
Yeah, this is the same as how it worked in UK (still works? I dunno). I didn't have a TV growing up, bought one when I was about 14 thinking I was being sneaky about it, address was taken when I was buying it and obviously some box got checked on some system somewhere and my parents got bombarded with letters.
