Since Carter/Reagan, FTC has historically not challenged these mergers because FTC and other legal agencies got swallowed up by Robert Bork who basically convin

Since Carter/Reagan, FTC has historically not challenged these mergers because FTC and other legal agencies got swallowed up by Robert Bork who basically convinced them that monopolies are actually good. So FTC and other agencies basically listened to paid off economists who were like "This merger will be fine for consumers" https://www.promarket.org/2019/09/05/how-robert-bork-fathered-the-new-gilded-age/ https://www.promarket.org/2019/09/05/how-robert-bork-fathere... Lina Khan has changed FTC which is why you see wave of this action but obviously anything law, it's very slow going.