As an Australian living in China one of the things that annoys me is that I have to provide all of my Australian bank accounts and investment accounts with my Chinese tax file number. I also have to tell my Chinese banks my Chinese tax file number. This only started 2/3 years ago.
This isn't for the Chinese government or the Australian government. This is for the American government because of the FACTA law.
The US government wants to have jurisdiction of everyone ... just in case you might be an American not paying taxes.