all ads sponsor with Twitch could be selective for streamers to choose and play them manually or at a time triggered. Before went on live, streamer should be able to choose and for example go to the home page top left category and select the kind of ads they want to play with. (viewers could also go to see what sponsor ads are supporting with the platform)
Or
ads company could create new form of ads to immerse into streamer's screen such as water mark & transparency logo flowing in a certain amount of time.