The movie studio is responsible for subtitles, you need to contact them with any complaints, Amazon has nothing to do with that. other than for the movies they produce. If the movies don't have subtitles in the language you want, there is no alternate "solution."
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You can always reach customer service for help here: amazon.com/contact-us
1. First all arabic speaking countries are welcoming western movies and cinema unless you are talking about porno movies!
2. Netflix is proving arabic subtitles for most of its works or movies streamed on its network!.
3. Subtitles are available for stolen copies or pirated without any cost! for most of all languages! Is it difficult for Amazon to arrange to include the subtitle??? it is 1-3 full time jobs to maintain this at first and then only one or two to provide the new subtitles!