yes but it seems that they simply updates the location path of uploaded files on the server, which is roughly like using a CDN which we already have.
What I was searching is something like what is used by JCE editor S3 plugin which uses a default images folder located at S3. That way seems interesting as the server size is kept low and we can duplicate instances in case of heavy loads without sync docs and images.
That would be an interesting thing to do for all apps, there were this
magazine.joomla.org/issues/issue-oct-2013/item/1552-cloud-storage-report and this
github.com/joomla/joomla-cms/pull/1925 but it has not been followed.
Interested ?