The tag is present in Lintian version 2.104.262. That is the most recent version we know about.
This package create a potential privacy breach by fetching data from a donation website at runtime.
Please remove this privacy problem and add a note to the debian/upstream/metadata file using the donation field.
Please replace any scripts, images, or other remote resources with non-remote resources. It is preferable to replace them with text and links but local copies of the remote resources are also acceptable as long as they don't also make calls to remote services. Please ensure that the remote resources are suitable for Debian main before making local copies of them.
Refer to https://wiki.debian.org/UpstreamMetadata for details.