The Hachette / Amazon dispute is
an excellent case in point: Hachette foolishly insisted that Amazon include Kindle DRM on its ebooks, and now all of Hachette's Kindle customers can only read them in the Kindle app, making it a harder sell for them to start buying Hachette ebooks from a different seller instead.
An excellent case in point would be last year's winner, Helen Marten, then 31, who had been tipped for greatness since she was a student at Oxford's Ruskin School of Drawing.