“OpMegaUpload” Anonymous appears to have not just relied on willing volunteers for DDoS attacks. Megaupload was mega-popular, with 50 million visitors daily, on average. DOJ was able to claim jurisdiction only because some servers were based in Virginia. RIAA, MPAA call the raids a “historic blow against one of the most notorious illegal distribution hubs in the world” Executives dismiss allegations as “civil case in disguise” and say they’ll “vigorously” defend themselves.”]
Source: https://www.darkreading.com/attacks-breaches/anonymous-retaliates-for-megaupload-raids-10-key-facts