I collect every book that I come across, and I can't count the number of times it's been helpful (one month, or five years later). It doesn't matter if you can't remember the book after a week, fzf is here to help you. If you got interested in a new topic (like the aforementioned Rust), press Ctrl+T and type "rust".

Or you can suppress the impulse and skip getting the book, then either forget the site altogether, or visit it five years later and find that it got shut down four years ago.