Serious question, but with a population of players as sizable as China has, why aren't they authoring their own addons instead of localizing Western addons? Does the Chinese WoW client still require Western characters for addons?
As an addon author, pay for addons config cloud saving, no problem. Download is free!
Well, if they do what you described (download, translation and rehosting), I'm not surprised they don't offer this service completely for free. Also 500kB/s is more than enough download speed. UI backup is not even something I use, so I guess also not a problem? I think China has worse problems than this :)
im sorry you have to deal with this type of stuff china its not your fault