Nvidia may be facing an DOJ investigation on antitrust concerns.Sam Yeh/AFP via Getty ImagesNvidia faces DOJ scrutiny over its $700 million acquisition of Israeli AI startup Run:ai.The investigation is part of a broader crackdown on Big Tech's market dominance.Nvidia's stock has surged due to high AI demand. It now faces antitrust challenges.Even Nvidia, which appears untouchable in 2024, may not be immune to the government's sweeping crackdown on the Magnificent Seven.The chipmaker is in the Department of Justice's crosshairs amid a years-long antitrust sweep.