Why can't foreigners use free wifi in Starbucks?

Gord Sellar is encouraging people to send a message to Starbuck's, letting them know that foreigners are prohibited from using the free wifi offered in South Korea's locations. Visitors wishing to use the service must login with a national ID number, though foreigners' ID numbers are incompatable with this and many other Korean websites. Gord calls it "discriminatory":

The fact it results from laziness or bad coding or whatever is one thing: the fact it has gone unaddressed although shop staff are aware of it — meaning its a zero-priority issue, where if the connection went down completely, for everyone, it would be a higher priority — makes it discriminatory.

And plus, it's, like, a foreign company to begin with.

* Update: Problem solved?