Maybe I'm being a bit cynical but given that there are data channels provided by some HDMI cables/endpoints - do we know that for example the Apple TV cannot su

Maybe I'm being a bit cynical but given that there are data channels provided by some HDMI cables/endpoints - do we know that for example the Apple TV cannot support an Ethernet-over-HDMI connection or that if it could support it, it's configured by default not to route traffic to/from this port? I think this feature was a commercial failure so hopefully it's universally unsupported.