S4 Capital founder Martin Sorrell offered his take on the Publicis-Trade Desk spat, Omnicom's "brutal" IPG takeover, and AI's role in reshaping agency business models. "The industry is at an inflection point," he said. Martin Sorrell, the founder and executive chairman of S4 Capital, did not hold back Monday when asked about the state of the advertising industry. Speaking at a virtual conference, the 81-year-old industry veteran offered unvarnished assessments of the biggest stories shaking the agency world. On the public dispute between Publicis Groupe and ad-tech platform The Trade Desk, Sorrell was blunt. The two companies have been trading accusations over data transparency and media buying practices, with Publicis recently pulling its clients' programmatic spend from the platform. "It's a spat between two heavyweights that should know better," Sorrell said. "The real loser is the client. When agencies and tech platforms fight over who controls the data, it's the marketer who pays the price." Sorrell reserved sharper criticism for Omnicom's acquisition of Interpublic Group, a deal valued at roughly $25 billion when announced. "It's brutal," he said. "The culture clash betwee...