In my opinion that's so typical Japanese. Concentrating on their own networks (it's about the same with Mixi; a community network similar to MySpace but with, maybe, 98% Japanese users only). Time to look for something more international, guys. 
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agreed, japanese for some reason is rather xenophobic when it comes to internet service.
I rarely see japanese use popular internet services such as rapidshare, megaupload, or mediafire. Or maybe I'm just don't know where to find forum like this in japanese sites (the most popular is 2ch, but most of the time they talk about winny)
Jam it back in, in the dark.