Amazon Accused by Booksellers of Antitrust Violation

What's with all these publishers having disputes with Amazon lately? Is there only one place in the world left to sell books?
German book publishers have formally accused Amazon of violating the country’s competition laws and have asked the antitrust authorities to investigate. The formal complaint, filed last week but announced on Tuesday, comes nearly two months after Amazon stopped shipping books from a leading German publisher, the Bonnier Media Group, amid a dispute over dividing revenue from e-book sales.