I'm astounded by how myopic so many people are on this issue.
Apparently if Netflix pays their ISP, then it ends there. Their ISP should have unlimited bandwidth towards another ISP.
Gee, what are the long term consequences of that?
Every network pays the networks they connect to. Some do it with money, others with mutually beneficial, and equal, traffic exchange.
Netflix pays/paid Cogent (and later Level3) who had settlement free interconnections with Comcast. The traffic FROM Cogent's network far exceeded the traffic TO Cogent's network, creating an imbalance that used to be considered an unacceptable practice on an settlement free link. The link also apparently congested in that direction as well, a similarly poor practice.
In the past, such a one sided imbalance would have led to the recipient of this excess traffic demanding payment for the overage OR throttling the connection in one direction to maintain traffic ratios.
Now, they're apparently not only supposed to accept this excess, but expand to accommodate more. This means Cogent gets free access to Comcast's network, which they can then resell.
If anyone can show that this is normal for the internet, or practice that was accepted in the past, I'd love to see it.