I searched on google and this one showed up https://shortbit.co/ but I cannot vouch for the sites legitimacy because I haven't tried it yet. They also have a thread here https://bitcointalk.org/index.php?topic=5139324.0

Other links on shorteners that pays in bitcoin
- https://shrinkme.io/
- https://shotly.io/
- https://exe.io/

Find more on these websites
- https://www.businessonhome.com/best-url-shortener-to-earn-money/
- https://earn01bitcoinperday.blogspot.com/2019/10/link-shortener-earn-bitcoin.html