Better ad implementation
The current implementation of ads is very lackluster, it either complete obstructs the gameplay without Picture-In-Picture and creates a disconnect to the stream which is a detriment for the entire twitch experience or it obstructs most of the stream.
A way better implementation would be to let the streamer control ad placement like cam placement in the stream and to have an ad window without audio that's about the size of a webcam. Especially with options like having the ads slightly transparent or as an overlay it could be way more attractive for companies as well since they get way more exposure over a longer time. Even the problem of ad-blocking can be avoided this way.