In some Apps from repository rpmsphere is some unwanted not signed software included:
Just use the official repo @updates for that.
All of this are available there. At least for x86_64.
To expand: the Fedora community only supports the Fedora repositories. Even sources such as FlatHub are not managed/maintained by us, so we do not control the content on them.
The only third party repository that the Fedora community recommends is RPM Fusion because it’s also managed/maintained by Fedora community members.
For other third party repositories such as rpmsphere etc., please contact their admins/community.