In the year 2000, Metallica drummer Lars Ulrich answered questions from Slashdot’s readers. Late Friday night, the AV Club described Metallica’s appearance at the opening ceremonies for the (now online) version of Blizzard Entertainment’s annual event BlizzCon: The opening ceremonies were being broadcast online, both through the official BlizzCon page, YouTube, and Twitch. And you know what happens when licensed music…