Thanks for your input. The email address is so that you can login afterwards, whenever there are new book chapters to be read. I'll clarify this, thanks!
Thank you for your input. I'm sorry you felt this, I'll try to improve the user experience. I'll appreciate any ideas you may have about how to improve this.
Hi, I'm the author of the book. Thanks for your input :)
The book is not free, this is not a paywall, and it's not a subscription: You are buying early access to the book so that you can start reading it before I am finished writing it. As soon as the book is complete, you also get an official digital copy of the entire book (PDF, mobi, epub, etc). The book is growing quite rapidly, it's currently over 50000 words covering many topics, so far mostly related to type-level reasoning. I will be adding a table of contents soon.