In the last several years, YouTube has become an increasingly formidable competitor to streaming services and entertainment studios, providing videos from amateur and professional creators, as well as livestreaming major events and NFL games. Now its growing threat to studios is headed to the courts. The Google-owned platform recently poached Justin Connolly, president of platform distribution from Walt Disney Co. On Wednesday, Disney sued YouTube and Connolly for breach of contract, alleging that Connolly violated an employment agreement that did not expire until March 2027 at the earliest. Connolly oversaw Disney’s distribution strategy and third-party media sales for its streaming...