Wildcards would be a useful tool for separating different site's media files when using a shared bucket folder across an entire network. For example, we could have a wildcard that uses the site's URL as the replacement.

Are there other useful ideas for wildcards besides the site's url?

idea suggestion from the wordpress.org forum at https://wordpress.org/support/topic/serving-the-same-media-to-multiple-sites/#post-9459270