After a conversation in the IRC. It is proposed to create a special page called Special:NewFilesGlobal that would work just like Special:NewFiles but would show the images that have been uploaded on all wikis (public and private) in the last 30 or 180 days.
Some of the reasons for this are:
Preventing the uploading of images with inappropriate content
Prevent the upload of images with insulting content
To enforce the other points of the content policy
could consider the security problem that occurred a few weeks ago as part of these reasons
All or only users with flags from Stewards, CVT and others may see Special:NewFilesGlobal.