Sometimes content I like hides behind a pop-up or a paywall. I avoid linking to such content when feasible. A small red flag indicates that a link I don’t control could give you problems or you may have to login/subscribe to get access to the full page. 

P.S. Try opening in an incognito window, accessing with Archive.today, or seeing if it’s been made available with Sci-Hub.

P.P.S. Thanks to Rotary Digital for the inspiration.