> in effect that's the case. When it's private organizations agreeing to rules about what they will or will not advertise as a bedroom for the purposes of comm

> in effect that's the case. When it's private organizations agreeing to rules about what they will or will not advertise as a bedroom for the purposes of commercial communication, that's called "capitalism" not regulation. To your other point, not all regulations have to be about safety to be valid. Preventing what is effectively false advertising ("bedroom" has a presumption of privacy for the inhabitant that is belied by having to traverse another person's private space) seems like a valid use of regulation. You can still sell the house, and a buyer can still observe that the room is usable as a bedroom, but you can't advertise the house as having a bedroom that a reasonable person wouldn't consider such.