You have no idea how BGP or peering works.
So what you're telling me is that if L3 Comcast link goes down for any reason at all, all Comcast customers would lose access to Netflix because L3 can't pass on their traffic?
Do you really think the internet is that fragile?
NO, you're paying for Comcast to transmit your packets to Level 3 and Level 3 is paying Comcast to transmit their packets to you.
Why isn't Comcast paying me to transmit their packets? After all, they are dumping a lot more traffic into my network than I am into theirs.
I am using exactly their rationale they use to justify charging L3.