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Re:Twitter is being investigated over data collection in its... by TheSmiddy on Sunday October 14, 2018 @06:46PM (#18215993)
Once the link shortening service knows it's a scam they can redirect you to a "saved you from being scammed" page.

(although evidence of this happening in practice hasn't crossed my radar, but it's probably because I just don't click those links in the first place)

Re:Twitter is being investigated over data collection in its... by eridius on Sunday October 14, 2018 @07:18PM (#18216162)
You don't need a link shortening service for that. The website and API can just start changing the URL it includes in the tweet if it determines the original URL is a scam.
Re:Twitter is being investigated over data collection in its... by megous on Sunday October 14, 2018 @07:35PM (#18216264)
They can redirect you anywhere. They can also rewrite anything in the URL, like add affiliate IDs or whatever. I'm sure some of them do that, because why not.