Crazy idea: what movie to watch next

I’m already working on a micro (nano?) SaaS called Wordblot, but just as a mental exercise, I’m gonna present a new idea here.

What if there was a service that could tap into my Netflix, Hulu, Amazon Prime, etc accounts and get a complete picture of what sorts of things I watch, and then recommend something for me to watch based on all of that?

Seems like it would be a game changer. I hate spending time between various services, trying to find something to watch. I’m sure this is a solved problem, but I haven’t researched it at all. Just throwing it out there to see what the hive mind things.