A lot of hacks already rely on visual/audio cues. An aimbot or audio-based wallhack doesn't need any input you don't want to give players.
Also, competitive games, especially shooters, are extremely sensitive to latency, so they are by their nature quite unfit for streaming. People who build PCs which render at 300 FPS to a 120Hz+ monitor for competitive play won't be happy to deal with even a quite optimistic 10ms additional roundtrip latency.
I understand, but in a sense, those unlevel the playing field. I get it isn’t a perfect argument since many people have slower internet latencies, but it everyone has to do it, you get rid of a ton of variables.
Also, competitive games, especially shooters, are extremely sensitive to latency, so they are by their nature quite unfit for streaming. People who build PCs which render at 300 FPS to a 120Hz+ monitor for competitive play won't be happy to deal with even a quite optimistic 10ms additional roundtrip latency.