An ISP selling Internet access to regular folks sells access to the entire Internet. To do that the ISP connect its network to the rest of the internet via a transit connection.
All your traffic goes through that unless you peer with other networks. When you peer with them you send less through your paid transit connection. So both parties benefit when they interconnect so long as they send a decent amount of traffic back and forth.
There's no such thing as a bandwith hog network. Netflix sends traffic to your network because your users asked for it and they pay you to deliver that traffic.
The notion that traffic ratios have anything to do with whether it makes sense to peer and whether someone should pay as long been debunked in the internet context. Those ideas are just remnants from the phone network which operates on a very different economic model, the one that make phone calls cost dollars per minute.
Here's a very clear presentation from 2005 from a NANOG meeting explaining exactly why you're wrong.
https://drpeering.net/white-papers/The-Folly-Of-Peering-Rati...
And you're also wrong but what neutrality is.
It's simply the principle that the network that you pay to get online doesn't get to interfere with what you do online. That encompasses lots of behaviors including interconnection.