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AI-written books have captured nearly 40% of sales. The number of self-published new books has surged nearly 40-fold, but actual sales and revenue only grew 7-9 times. Low-cost, high-volume "Book Slop" is diluting the entire market.
Spotify announces a new ElevenLabs-powered tool for self-publishing audiobooks within its Spotify for Authors platform, launching in beta this June with English support.
Self-published books surged 40% year-over-year in 2025 (2.5M to 3.5M), with AI detection tools flagging a corresponding 40% increase in AI-written content, showing nearly 20% of sampled novels contain substantial AI-generated text.