John Siracusa on the Apple strategy tax
A strategy tax applies to one product of a company that becomes worse in order to help another product. A historic Microsoft example is where “the Internet Explorer team is not allowed to fix the DHTML editor because it might compete with Word.”
John Siracusa argues that the recent requirement for apps to use Apple’s in-app subscription  is a case of a strategy tax: The variety of iOS apps suffers (Sony’s ebook reader has already been rejected), because Apple thinks it has to make this move in order to protect its own book, movie and music rental business.
changes in-app purchase policies: an analysis