Curious about why. I'd understand a social stigma against ad-based redirection services, but does that translate into a frown against all shorteners somehow? Or is there some other cause?

They obscure the destination, track users, and break at some point in the future leaving a bad link in the archives.

Thanks.

Some of these aren't properties exclusive to redirection sites... but I'll readily admit they're very much standard features there, while mostly not too common elsewhere.