There's a project[0] designed to archive various URL shorteners to combat the link-rot problem. It's ran by ArchiveTeam which is a bunch of preservationists who are hell-bent on preserving parts of the web that otherwise would go into the dustbin of history.
[0] https://wiki.archiveteam.org/index.php?title=URLTeam
[0] https://tracker.archiveteam.org:1338/status