Remove zip files from downloads server for permanently closed plugins.

[peterwilsoncc]

A plugin's zip file remains available on the downloads server pretty much forever. As a case in point, this plugin for app.net was developer closed some years ago ​https://downloads.wordpress.org/plugin/rapid-adn-widget.latest-stable.zip

I think it's safe to remove the download files once a plugin has been permanently closed, either by the plugin developer or by the plugin team.

[dd32]

Related: #3263 is a request to remove ZIPs once a tag is deleted.

Deleting the ZIPs doesn't benefit WordPress.org, as we're storing the ZIPs within SVN and deleting the file actually causes more disk space to be used.
It'll also add extra future complexity, as we'll also likely have to add additional CDN purging for old ZIP file URIs.

For permanently closed plugins, I can understand blocking access to the ZIPs though, however, currently the Plugin ZIP download links don't require access to the database, and adding a block here would require it.

I'm not sure there's really much benefit here? We're not linking to the ZIP, the source code can be retrieved from plugins.svn.wordpress.org, even if the author has removed details from plugins.svn, you can still access historical SVN revisions.

[dd32]

Closing, as the ZIPs are simply archives of open-source code, and I don't personally see any justification here for why they should be removed. #3263 may change that.