No worries! Always good to see what alternatives are available. I bought moon+ reader a while back so happy to support good products.

Wow, shelfmark looks really cool. I like the customisation moon+ reader offers for the UI, but find the progress sharing a little lacking, so will take a look at readers, thanks.

Download books from libgen, Anna’s archive, torrents. Move (sftp) to a watched folder on my pi4 that’s running calibre and then download from server using moon reader.