Maybe this might help: https://en.wikipedia.org/wiki/Google_China
"Google China is a subsidiary of Google. Once a popular search engine, most services offered by Google China were blocked by the Great Firewall in the People's Republic of China" and, more precisely:
"In November 2012, GreatFire.Org reported that China had blocked access to Google. The group reported that all Google domains, including Google search, Gmail, and Google Maps, became inaccessible. The reason for the blockage was likely to control the content in the nation's Internet while the government prepared to change leadership"
"The block is indiscriminate as all Google services in all countries, encrypted or not, are now blocked in China. This blockage includes Google search, images, Gmail and almost all other products. In addition, the block covers Google Hong Kong, google.com, and all other country specific versions, e.g., Google France. It is the tightest censorship ever deployed."
In other words, it doesn't work in China because anything and everything Google is blocked there by the great Firewall of China. So unless Nintendo finds another partner, even just for China, the Online Membership won't work there.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
List as Google Doc: https://docs.google.com/spreadsheets/d/1aW2hXQT1TheElVS7z-F3pP-7nbqdrDqWNTxl6JoJWBY/edit?usp=sharing
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/