Here's the one of the most egregious examples of LinkedIn's dark UX. The transition from "I'm accepting incoming invites" to "I'm inviting people to connect or join LinkedIn" is intentionally subtle: https://goo.gl/photos/ncnTiMWeSBJfg3rZ6
Also tried a different browser with a clean slate, no issues.
Maybe the link was edited?
(of course, that's not true here and you don't have to sign in)
I'm thinking of Dropbox, which does this when you try to access a link that someone shared with you by email https://a3nm.net/share/2016-12-07_548165.png
This is a dark pattern because it's trying to make me believe that I should create an account when obviously I just want to get the file that my friend sent me. The link to download the file directly is at the bottom of the message.