The analogies here always end up all over the map, but the walking-into-a-house one seems pretty off. The service is set up for anonymous public access, run by an automated process designed to service requests, and faces a public thoroughfare. If we have to make IRL analogies, that sounds closer to a vending machine or other kiosk on the side of a road. In that case, you probably wouldn't have much faith in whether people will follow any instructions you tape to the machine.