How is Netflix second in upstream traffic, at 6.78%? What are users sending to Netflix besides an occasional request for more data and maybe some telemetry?
[1]: https://technifyme.wordpress.com/2013/02/26/netflix-uncovere...
You're sending a ton of real time data about stream quality and network congestion to help make sure you get the best possible experience. By adjusting your client to compensate for whatever local issues you might be having at that second and combining that with overall data, Netflix can do things like route around broken local routers and other sorts of things, as well as contact ISPs on your behalf if there are systemic issues.
That is awesome: So if I just continuously stream Netflix, I get free monitoring and incident response? Thank you! :)
More seriously, it's great that it works out this way. Most end users have no ability to identify the cause of problems much less do anything about them, and even technical users rarely have the time or resources (unless it's their job).