After two decades of nearly unrestricted, unregulated growth, the world’s largest tech platforms are now under active legal attack by governments in multiple continents at once. | Michael M. Santiago/Getty Images On Friday, the U.S. Department of Justice made its final pitch in court that Google is an illegal monopoly in the lucrative online search market, the backbone of the $2 trillion company. Across the Atlantic, the European Commission is investigating whether Google is violating the Digita...