I think I know what Biologist is talking about. I also have a collection called "Fakku Rewards." I was able to find the forum threads. Here are some of them among the many threads that are all labeled "FAKKU Books Gift Week":
https://www.fakku.net/forums/books/fakku-books-freebie
https://www.fakku.net/forums/books/fakku-books-gift-week-3
https://www.fakku.net/forums/books/fakku-books-gift-week-13
I have a total of 12 different chapters that were saved to that "Rewards" collection I have.