[cmpb]

PiHole[1], with the default adlist/gravity configuration, actually works pretty well for removing ads from my LG smart tv from about 3 years ago. Doesn't keep it from updating, but you can easily configure pihole to block whatever domains you want

[1] https://pi-hole.net/

[ceejayoz]

Some TVs have gotten wise to this, and are using IP addresses or serving ads from domains that are also needed for things like installing the various apps like YouTube/Netflix.