If Amazon are found to have acted in the same way that Apple previously tried, then surely that would make them just as guilty? That stuff to do with contract terms being at least as good as competitors in particular sounds eerily familiar.
Personally though I'd settle for getting the same treatment as US customers. There are a number of both audio books and ebooks not available to people in the UK despite them being available on the other side of the pond - and not new ones either, since the ones I'm currently trying to find are old Asimov novels.