I don't think so - because plain city phones are linked to the apartment, not a particular person. If they will be linked to a particular person, how come if you let another person to talk to someone by phone you can get disallowed?
Same goes to every website, not just KW. When the account is a common property of a group of people, not just particular person (i.e. siblings or twins), do you think it should be banned?
It can also be very clean thing - due to older siblings standing up for their younger ones and trying to regulate relationships.
The hate can't die by hate, but only with love (Buddha)