For most of its existence, this site has been inaccessible to people not in the USA. This is a good way to reduce the spam, hacking attempts, etcetera.
That said, locking things down in this manner apparently prevents me from getting approved as a Google advertiser. The site isn't free, so I'd like to at least partially defray the costs of operating it.
So, for the moment at least, the site is accessible worldwide. I appreciate your understanding as the inevitable Euro-spammers join in the action. It will be over soon, I hope!