Roku Inc. (NASDAQ:ROKU) is gearing up for a platform monetization sprint, and investors are starting to tune in. After a strong showing at the JPMorgan U.S. All Stars Conference in London, Roku’s management has made one thing crystal clear: it’s all about accelerating platform revenue growth. Shopify Integration Boosts Roku Ads ManagerRoku has launched Roku Ads Manager, a self-service CTV performance solution featuring the first-ever Shopify Inc (NYSE:SHOP) integration for shoppable campaigns. This new platform is designed to help direct-to-consumer brands of all sizes easily purchase CTV vide…