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I'm not deaf, so I may not be exactly answering your question, but one of my friends is not a native English speaker, so when she comes over and we watch movies, we use Netflix because of the (generally) excellent captioning. It helps her follow the dialog. It was pretty recent that Netflix fully implemented closed captioning. I think that the American with Disabilities Act mandates closed captioning in many cases, but I'm not sure what the trigger is for requirements.
Amazon is being accused of noncompliance with video captioning rules - See ITworld Phil Johnson's blog post here. I am curious what experiences people are having.