Yeah, Readarr is unfortunately the black sheep of the Arr stack. Ebook torrents are notorious for failing/stalling, and the Readarr team has had some major issues with their metadata server in the past year or so, meaning adding new authors/books is often impossible.

It can be nice for tracking what you’re missing, but I end up using manual searches for most of my ebooks. Ebooks tend to work best with direct downloads, (Z-Library, Anna’s Archive, etc) so an Arr service reliant on torrents is spotty, at best. It isn’t even actively being developed, and the devs still attached to the project have even said that it will likely stagnate and fall into disrepair unless a serious dev is willing to take over the project.