There is a permissions problem on the RPM repository. On openSUSE LEAP 42.3 I get:
# zypper ref brave-rpm-release Permission to access 'https://s3-us-west-2.amazonaws.com/brave-rpm-release/x86_64/media.1/media' denied. Abort, retry, ignore? [a/r/i/...? shows all options] (a): a Abort, retry, ignore? [a/r/i/...? shows all options] (a): a ABORT request: Aborting requested by user
If the repository URL has changed, the instructions on the download page should be updated to reflect this. Otherwise, please fix the permissions.