Only reason LG doesn't have adverts is by forcing it to use a pihole, but even that needs updating -- recently they've managed to push things through and I need to do another investigation to see what needs blocking. Trouble is I only see them when I'm not in the mood to be working, and then forget about them
They hardcode DNS servers into the TV. You need a firewall in front of the pihole intercepting that traffic, I use OpenWrt.