I have a slightly older LG OLED and I don't get any ads -- I just haven't accepted any of their policy checkboxes and that seems to keep things at bay. There some very minor features (Alexa integration) that don't work but everything else works fine.
I have a C!, and didn't accept the policies either.
This worked for a while to prevent ads, but now the ads ignore the policies and show up anyway, and they became really obnoxious, including the notification system sometimes showing ads while you are using the TV.
