TrialnError [1] filed a deletion request for nextcloud-app-radio-git [2]: URL is dead. Alternative upstream repo is archived since 2020. Additionally the previous maintainer was also the upstream developer. And onny dropping the package tells us something. With how nextcloud advances this will be incompatible in one way or the other with recent nextcloud versions.
[1] https://aur.archlinux.org/account/TrialnError/ [2] https://aur.archlinux.org/pkgbase/nextcloud-app-radio-git/
