Kobo rejected 45% of self-published books last year, mostly over AI

Rakuten Kobo rejected 45% of all titles submitted to its Kobo Writing Life self-publishing platform in 2025, with CEO Michael Tamblyn attributing over 80% of those rejections to low-quality AI-generated manuscripts. The platform received hundreds of thousands of such submissions, representing a dramatic shift from just a couple of years ago. Kobo relies on quality as the practical rejection trigger rather than definitive AI origin detection, acknowledging that AI-detection software is unreliable. The platform's terms explicitly prohibit wholly or partly AI-generated content and reserve the right to use AI itself to evaluate submissions. This contrasts with Amazon KDP's approach of requiring authors to self-declare AI-generated content rather than outright refusing it.

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