Microsoft CEO Satya Nadella testified that tech giants are competing for valuable content to train artificial intelligence models. He expressed concern that Google was securing content through costly exclusive agreements with publishers, comparing it to early distribution deals. This testimony came during a significant U.S. antitrust trial against Google, focusing on distribution agreements and Google's alleged illegal payments to maintain default search engine status. Nadella emphasized the importance of computing power and data for AI development but found it problematic when companies locked up exclusive content deals, creating challenges for competitors.