[omegalulw]

> and no, you can't just whitelist them because some companies uses their own different shortlinks like t.co, fb.me, g.co, msft.it, redd.it, and youtu.be

It won't be terribly hard to build a top 50 list of url shorteners etc that cover the vast majority of the traffic.

[jabiko]

I think some URL shorteners allow editing the URL after creating a short link. So you are back to square one

[jcpham2]

If it stores the short link and destination url in a database that can be modified, yes.