Your argument about everybody has paid for their bandwidth and Comcast wants to double-dip isn’t quite correct.
The end user buys bandwidth from Comcast. Netflix buys bandwidth from a bunch of different people, including Cogent. Cogent had a peering agreement with Comcast that allowed them to send a certain amount of traffic into Comcast for some fee (or perhaps for free if the agreement was for balanced traffic). Because Netflix traffic is almost entirely one-way, Cogent was operating outside of the agreement with Comcast so Comcast did what their agreement says they can do - demand money from Cogent. Cogent didn’t want to pay and so Comcast did the other thing their agreement allows - throttle.
Customers complained loudly and so Comcast and Netflix made a deal for Netflix to peer directly with Comcast. This saves Netflix money and gives a better experience to customers.
Netflix always had the option of using a different network. Comcast customers who watched Netflix on their Apple TV devices never experienced this problem because (for some reason) Netflix sends Apple TV streams over Level 3 and Level 3 was operating within their agreement with Comcast.
This has nothing to do with net neutrality.
If the end user were to download 24-7, they would eventually hit their data cap and Comcast will throttle the connection. Would you call that a net neutrality problem?
