The approach I’ve taken is to just keep my TV off the internet (never join a WiFi network) and make it smart via an Apple TV, which I personally believe to have the strongest privacy protection of any smart TV device. Another bonus is my TV UI hasn’t changed despite changing and upgrading TV brands.
Ethernet was added to HDMI https://thehometheaterdiy.com/hdmi-with-ethernet/
https://en.wikipedia.org/wiki/HDMI#HDMI_Ethernet_and_Audio_R...