> My question is why Open Connect Appliance wasn't even in their network in the first place?
By having Open Connect Appliance network gives up ability to traffic engineer Netflix, which may decrease the leverage the network has with its peers or its transit providers.
Fundamentally, unless someone must peer with you (settlement or settlement free) and must peer with you on your terms ( locations, types of connections, etc ) you always want traffic that you and only you can control.
No matter what, SK Telecom is going to be eyeball (ingress) heavy and no amount of engineering of Netflix traffic is going to help with that, as it's all inbound anyway. Not that Netflix's upstreams like Level3 or Telia would be peering with SK Telecom anyway. Reducing the amount of Netflix traffic can only help.
Traffic engineering does not just cover what. It also covers where. At the eyeball network level where is way more important than what as what is constant.
By having Open Connect Appliance network gives up ability to traffic engineer Netflix, which may decrease the leverage the network has with its peers or its transit providers.
Fundamentally, unless someone must peer with you (settlement or settlement free) and must peer with you on your terms ( locations, types of connections, etc ) you always want traffic that you and only you can control.