Ya, well, Moca 3 is pretty new BTW, and it's not your mommy's ethernet over coax, you are thinking of old timey ieee802.3 this is full on OFDM modulation over coax, RF'ey stuff like Docis. Fios uses this to get your signal in over your house cabling.

I use it to get my mm-wave 5G 2Gbps signal from my antenna on my garage over the same coax my cable TV runs on to my lab in my basement and have a wifi AP for the rest of the place.

Ya, sorry, I stream but I still like my cable, shrug :)