qBitController is a free and open-source app for controlling qBittorrent from an Android device.
I understand the developer may be known and trusted
But I do not have the expertise to do my own thorough code review
If that's of your concern, you can't download the play store version either. It is the same app, has the same signature.
Excuse my ignorance and correct me if I'm wrong
But does the play store not do some sort of scanning itself?
Even worse. Many apps have google signature instead of the developers. They upload their key and give it to google. Horrible practice. Nowadays, fdroid gravitates towards reproducible builds with the dev's own signature and google is going the other way round. Gravitating towards an unsafe "best practice" ...
I wish there was a good free and open-source downloader with torrent support, like 1DM+.