I am a bit confused about what's so outrageous about this tool. It seems that both the book authors, and some of the people in the discussion here, conflate rudimentary statistics about a book (number of words of certain kind) with the latest wave of generative AI. They are very different in both what value they provide, and what risk they pose to book authors.

The tool that book authors got outraged about only provides basic metrics, not dissimilar from other metrics such as "page count", and can't be used to produce new content which could deprive the book authors from revenue.