Don't forget Amazon does the same for physical goods purchases (I don't know about their streaming service). Your purchase history is not available via their API. Product reviews are also no longer available via their API.
They don't mind listing their products alongside other retailers. Otherwise many shopping comparison engines would go bust. They probably allow it, not from the goodness of their hearts, but only because it drives sales seeing that they usually come out on top in price comparisons.
Netflix probably doesn't make much money off people coming to them via comparison apps (because they are already signed up anyway).
Building your entire business on top of one or two powerful companies' data and APIs will always be extremely risky. So, it's best left for hobby apps.
They don't mind listing their products alongside other retailers. Otherwise many shopping comparison engines would go bust. They probably allow it, not from the goodness of their hearts, but only because it drives sales seeing that they usually come out on top in price comparisons.
Netflix probably doesn't make much money off people coming to them via comparison apps (because they are already signed up anyway).
Building your entire business on top of one or two powerful companies' data and APIs will always be extremely risky. So, it's best left for hobby apps.