Sort of like using Twitter as a URL shortener.
Do not recommend abusing this.
Rimgo is basically a frontend for imgur that you can selfhost (or use a public instance). The LibRedirect browser extension automatically replaces the imgur.com URL with the specified rimgo instance.
So for example https://imgur.com/gallery/eMKxD6t turns into https://rimgo.pussthecat.org/gallery/eMKxD6t.
It is online since 2006, does no obviously evil browser stuff, and the guy hosting it seems cool.
eg: https://imgur.com/4clqUdj.jpg (picture of a cat)
since the traffic appear to come from the main domain to them, it does to redirect back to the html page.