I can see you point about a deals and freebies index, Peto. But it would be a real trouble to administer. Unlike the Book uploads index, the freebies often expire. They are available in a host of formats and restrictions. Cataloguing them, and keeping the list accurate, would be a nightmare.
Thanks for contacting the author. It looks like a very interesting book.
Of making many books there is no end [Ecclesiastes, 12.12]