Easy solution. Do not connect your TV to the internet.
I don't think it's unreasonable to think that the television would search for unsecured wi-fi or other ways of connecting to the internet without user input.
I'm not sure if any TVs currently do this, but they could connect to unsecured public WiFi without the user doing anything, if one were available with no password. Fortunately such networks aren't that common most places, but it's not a big leap from the sketchy things LG and other companies do. They could also put SIMs in them if they wanted. Again, I don't know that any do that, but I wouldn't put it past them. I'm not that paranoid, but I don't trust them to be up front and ethical.
A TV not on the Internet is basically worthless these days, unless you have a third-party streaming device like a Fire or Shield--and then you're just moving the trust point from the TV itself to the streaming device, and the same concerns exist. Do you trust Amazon any more than you trust LG?
Agreed. I leave my tv disconnected from the internet, and connect my Apple TV instead… the default UX on most tvs is so much slower and add-riddled than Apple’s
I’ve had TVs that had important firmware updates that improved hdmi/atmos/etc compatibility
Also debunked in the Gamer Nexus video. The TV will scan for public wifis and connect. Watching the video, it also seemed like a "missed opportunity" for LG to not create a mesh network of LG devices that would help eachother connect to the internet. So the LG device on your neighbours wifi might help your not connected TV to some tasty internet access. Or at least to unload its cache of A(V)CR fingerprints.
LG is truly an adversial party in all of this.