Bargaining Power in the Streaming Industry

Does Roku need WarnerMedia more than WarnerMedia needs Roku (WSJ, Dec. 2020). Also, who is buying and who is selling? "Roku initially paid media companies to license content for the channel. But lately, Roku has demanded programming from media companies as a toll for carrying their apps, people familiar with Roku negotiations said. If media companies provide enough compensation to Roku in other ways, such as ad or subscription money, the company relaxes its demands for Roku Channel programming."