But how do they know what you're looking at and how are they using this information to do anything useful? I get you can probably differentiate between text and video, but I'm having trouble understanding exactly what information they would get from your bandwidth consumption.
If there's an image of size X and they observe a download of X bytes, they can infer you downloaded and possibly looked at that image. The file size alone might be unique enough to allow that.
What they do with this information is anyone's guess. Just viewing something could put you into some kind of government watchlist. They could use parallel construction against you.