High-rank Overwatch streamers usually get ~20 mins of queueing right now and that is often filled with another game or a youtube game.

I suggest a way to only view streams that are in-game, and to automatically go to the next streamer if the current stream doesn't have any gameplay. Or to have some small badge saying "In-Game" show up on the thumbnail.

The easiest way of implementing this is using some lightweight ML Video Classification. I assume you are probably using a GPU to do remux, and you can utilize those GPUs for classification inferencing. You probably won't even need to classify each frame, probably once every 10 seconds.

I think having the ability to watch a short playback of the stream you hover would be an efficient way to help people watch content that they want to see instead of going through stream and guessing on what is going on in the live stream at the current moment, (getting baited from a thumbnail picture.) It might help people with low viewer count get more attention because people don't need to waste time to click on the live stream. It might be a good idea to test out a beta version to see if the idea is successful before permanently implementing the hover feature for the future.