txtsd [1] filed a request to merge prowlarr [2] into prowlarr-bin [3]: I'll be correctly turning all the *arr packages into their -bin variants, and making the regular packages build from src instead.
[1] https://aur.archlinux.org/account/txtsd/ [2] https://aur.archlinux.org/pkgbase/prowlarr/ [3] https://aur.archlinux.org/pkgbase/prowlarr-bin/