I'm sorry, but do we actually know that they are trying to block foreign users?
The basic countermeasure of simply blocking access from foreign IP's should be near 100% effective against users who make no effort to conceal their location, and yet myself and others continue to be able to make use of the service from abroad without resorting to proxies.
While I don't speak or read Japanese, the google translation of the reply seemed like a basic canned CYA response from their tech support.
This is how I interpreted the message:
That's my take on it at least. While I realize that important meaning can easily be lost in google translations and that you all may have additional information that supports the case that they are attempting to block foreign users, my current opinion is that they're not trying to block us out. However they also won't expend any resources to help troubleshoot our problems or provide a smooth user experience to foreigners.
I don't think the service outages that many of us have experienced have been deliberate attempts to block our access. I suspect that they're benign technical issues caused by problems on their end or somewhere along the network between them and us.