Not sure if anyone else has run into this before, but I set up my Amazon.com account to link to my Amazon.co.jp account a while back and put a Tenso address in to buy ebooks. I hadn’t really bought many books, just a couple of cheap children’s picture books, since my reading wasn’t really good enough to get through a novel without a dictionary, and I didn’t really realize that I could get a J-J or J-E dictionary on the Kindle app until today. So I bought the first HP off Pottermore in Japanese, but I linked Pottermore to my Amazon account to send it to the Kindle, and apparently that was a mistake. Well either that or buying a dictionary off the Amazon app store was, I’m not sure which part raised flags on my account.
Either way, shortly after the purchases, I got an email from Amazon telling me they needed to see government proof of my residence in Japan in order to continue buying Japanese ebooks. I’m pretty sure they can’t do anything about me buying HP off Pottermore, since those options are available in the Pottermore store seemingly regardless of region. But given I can’t provide proof of living in Japan, I’ve set my address on Amazon back to the US and won’t be able to get ebooks off there in the future unless I move, it looks like.
On the bright side, having an inline dictionary is pretty awesome. I think what’s actually most useful for me is really the pronunciation help– sometimes I can get the gist of the word via kanji, but if I don’t know how to say it it’ll never really be part of my vocabulary. So the inline dictionary often can help out there without breaking up ‘flow’ too much. Looking up anything via radicals takes so much time, it’s impossible to really read that way, and while the dictionary does still make for more pausing than strictly extensive reading, it’s easier to just check quickly and return to the text.