Rumble Inc. (NASDAQ:RUM) in conjunction with Elon Musk’s X, formerly Twitter, has lodged antitrust lawsuits alleging a conspiracy to withhold advertising revenue. What Happened: On Tuesday, the U.S. District Court for the Northern District of Texas received the filing from Rumble, which named the World Federation of Advertisers, advertising agency WPP, and its subsidiary GroupM Worldwide as defendants. Sharing the development on X, Rumble’s official account stated, “Rumble has joined X to sue a cartel of advertisers and ad agencies who conspired to block ad revenue from going to certain platfo…