Yep, Beta List uses Bit.ly Anyone can set up their own short URL domain with them. They also allow you to export* your short-url/long-url pairs so it's possibl

Yep, Beta List uses Bit.ly Anyone can set up their own short URL domain with them. They also allow you to export* your short-url/long-url pairs so it's possible to switch to your own shortener at a later stage if you wanted to. * The export feature might be available to Enterprise customers only. Not sure.