I get the impression they're running analytics not just on the users but also the content (which would take more horsepower). Guessing they use the analysis to

I get the impression they're running analytics not just on the users but also the content (which would take more horsepower). Guessing they use the analysis to model scripts and generate ideas for their Original Series. Thinking of what is needed to do this, you need to analyze themes, characters, story lines, visual effects, music, many components, and then tie them to user types and viewing patterns. Then they create series with either wide appeal or strong appeal to a very small niche. On top of that, these shows load almost instantly while you're still determining whether to watch or not.