The real trick is to never connect your TV to the internet under any circumstances. These things are displays, they don't need the internet to do their job. Leave that to the game consoles and streaming boxes.
It's going to happen on any device. It's a software thing. If LG isn't doing it, it's Netflix, Amazon Prime, etc. My PS5 basically shows ads on some system ui screens (granted mostly for "game" content but it still counts).
I worry about the new cellular standards that support large scale iot.
Search for 5g miot or 5g massive iot or maybe even 5g redcap