If you have Comcast and a smart TV, there are 2 ways to use Netflix. Comcast has a Netflix app on their system, accessed with the Xfinity button on your remote. If you use the Comcast app, you are not using your wifi to view the Netflix content. You don't even need to have a router. You are receiving the Netflix content directly through the Comcast cable. But, if you use the smart TV hub, then you are using your wifi signal to receive the Netflix content. This also applies to Youtube, but not to Amazon Video. There is no Comcast app for Amazon Video.
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