" First being that most Android TV boxes are rooted."
Wow, this is so far from being true, it's not even funny. You're confusing rigged Chinese Android TV boxes with the official Android TV product available on consumer devices like the nVidia Shield, as well as is built into several OEM TVs like Sony and Philips. These are just like Fire TV or Samsung or Apple TVs and are not rooted. This is just Comcast being difficult for no reason.
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