YouTube's Trampled Foes Plot Antitrust Revenge

(Bloomberg) -- Brian O’Kelley built AppNexus Inc. to help companies advertise anywhere on the internet. Its software plugged into virtually every digital ad-trading hub, including those from Google, the biggest ad seller, and Google’s YouTube video service. By 2014, AppNexus was valued at $1.2 billion.Then, in 2015, Google stopped letting companies buy ads on YouTube using outside software. The move got more marketers to use Google ad services. It also created a glaring hole for AppNexus:...