I don't like that these get submitted either, but unfortunately people do post worthwhile stuff there and only there, and I don't want to just categorically forbid those posts.
Twitter still does have quite a lot of unique content that either appears there first or isnt accessible anywhere else at all, unlike paid article websites, previews without logging in actually work for the most part, and xcancel as you said is a thing. Which extension are you using for redirects?