> If so, they need to tell people how not to broadcast their SSID.
Why? There's no problem broadcasting SSID and hiding it just makes their network more annoying to access. I hope you're not about to cite the urban myth that hiding the SSID is helpful for security reasons, because it's not. That's about has helpful as covering up the number of your house with a post-it note if you're worried about people finding out where you live