Regulating or breaking up large digital companies won't be easy. In the late 19th century, the old Standard Oil Trust controlled an estimated 90% of the refined petroleum industry. Although the trust was first sued on antitrust grounds in the 1890s, it successfully resisted breakup until 1911. The original Robber Barons fought, on all fronts, to maintain their monopolistic advantage: in the courts with armies of lawyers; politically with campaign donations (one senator was only half-jokingly referred to as the Senator from Standard Oil); and through public relations campaigns, arguing that their size served the public interest, or that their power wasn't as extensive as it appeared. Our new Robber Barons will likely react the same way to any threat to their profits. But if we don't act, we risk stifling future innovation and being crushed by these new corporate giants.