Corporations.
Sure some corporations might be altruistic and not throttle sites like Netflix, but in a market like ISP where the infrastructure is not accessible and the barriers to entry are extremely high, Net Neutrality protection helps customers and encourages new businesses as the entryway is uniform and unbiased. History shows us that if a company can gain an advantage and gouge customers... they will. Sad truth. Is it better if the Government doesn't have to step in? Of course. Is it necessary sometimes? Yes.