A theoretical example situation:

Lets say we have an application, where the source code is licensed under GPL v3.0+, that bundles part of Wikipedia. Wikipedia licenses its downloaded content under CC-BY-SA 3.0 (Reference: https://en.wikipedia.org/wiki/Wikipedia:Database_download).

Lets also say this application is specifically constructed to be an offline interface to the bundled Wikipedia database. Without the database, it's useless. Thus, a significant part of the application is its database.

Should the project license be GPL v3.0+ and CC-BY-SA 3.0? Doing so means it will effectively mark it as proprietary (by e.g. GNOME Software), as creative common licenses are not recognized by opensource.org.