…they’re strangling e-book competitors:

The store was removed because Apple rejected any updates which included it, period. They also rejected any updates which stated that Apple required its removal, or indeed any mention of ‘compliance with App Store guidelines’. It was further rejected for the cardinal sin of allowing users to create a Kobo account within the app. Then it was rejected for providing a link to let users create an account outside the app. Then it was rejected for simply mentioning that it was possible to sign up, with no direction on where or how one could do that. Then it was rejected for making any mention of the Kobo website. Then for any mention of ‘our website’ at all, in any language. We additionally cannot make any assertions that Kobo provides content for sale, however obliquely.

(from this review of the crippled app)