Twitch allows streamers quite a bit of control over when and how ads run, including manually triggering them. As long as they run a certain number of ads per ho

Twitch allows streamers quite a bit of control over when and how ads run, including manually triggering them. As long as they run a certain number of ads per hour, you don't see a preroll. The streamer you were watching didn't bother to reduce ads to short 15 second chunks or run them manually during slow points like sitting in-queue.