After more than 70 million views and seven years worth of bait-n-switch links, YouTube has killed the original “RickRoll’D” video. Rick Astley’s 1987 hit “Never Gonna Give You Up” became an unexpected fixture of Internet culture when pranksters would link to the song’s music video instead of whatever the online text promised. As anyone who’s ever been RickRoll’D knows, the results were always hilarious. YouTube hasn’t commented on why they took down the video—killing off a piece of Internet history—but the RiskAstleyVEVO channel has an intriguing theory …