There's a lot of things I'd want to address beyond the tech: I'd want the videos to have good subtitles, to actually be what was requested and not have surprise porn or whatever, for examples. I don't think these are things I could automate. Netflix is likely to include subtitles and will never return video that wasn't requested. I dunno, it's work the few bucks a month.
Streaming services including Netflix regularly omit subtitles for non-english dialogue, I've found. For a significant number of movies this this can make them unwatchable.