The main objective of this research is to quantify for the first time the phenomenon of books authored by ChatGPT for sale through Amazon. To do this and with the help of a quantitative descriptive methodology, this work analyzes the evolution of books written by ChatGPT, and the characteristics of these works—typology, language, price, extension and type of edition—are determined. Also, this research studies those authors using ChatGPT and discusses the scope of this phenomenon, proposing measures and actions that promote transparency and good practices in the publishing industry regarding books written by artificial intelligence (AI) tools. Finally, this work concludes that ChatGPT is having a significant impact on the publishing world, from both the creation and distribution of content, so the appropriate balance between the use of AI and human intervention will continue to be essential to maintain a diverse and creative publishing industry.