Are these sort of things only open to US users? many apps I find on the net I scan the QR code and it finds nothing. I'm in Australia, so I assumed Pandora, Las

Are these sort of things only open to US users? many apps I find on the net I scan the QR code and it finds nothing. I'm in Australia, so I assumed Pandora, Last.FM etc were all region specific, but this? I wish it would at least tell me that I'm not eligible rather than just saying nothing was found.