The publishers' last stand.
Most publishers are still living in the late 20thC. Most didn't even manage to transfer to print on demand (PoD) before ebooks became established. They don't control any of this new stuff and they are running scared.
Late to PoD means that all sorts of Johnny Foreigners created start-ups to flog books off the back of Google Books and nick some of their trade. New publishers also started up beginning with a PoD model (like Lulu.com).
And publishers are well behind on ebooks too. By the time they had worked out what they are, Kindle had taken the market. Amazon own Kindle and have already become the default global distributor of books (slaughtering the national divvy-up, published in US, published in the UK etc, to boot).
So publishers who once controlled the market are now the farmers to Amazon's Tesco.
Expect many of them to go the way bookshop chains have gone (and farmers).
They were just very slow to change, never quite understood that they had an entirely new form of competition, and couldn't get the hang of the new marketplace. Their best responses were a series of mergers and an eNBA.
This is their last stand and they will lose it.