Dear creators and developers!
If you share your project on a Git repository such as GitHub and GitLab, it’s great if you consider declaring general files as your favorite license, and artwork/image/video files as “CC-BY-SA 4.0” license.
Because it seems when you upload an image file to Wikipedia, Wikipedia only allows some CC licenses for that. The “CC-BY-SA 4.0 license” is the default one. So, you or someone can upload your image file to a Wikipedia page on the license.
For details and how to declare the license, you can see this pull-request.