Because most people (HN is not a representative sample set) are not willing to pay the real price of a TV if it wouldn't be subsidized by adtech.
Google’s global ad revenue equates to roughly $61 per user per year, most TV manufacturers would be unable to extract that much out per user, even with crazy levels of tracking, ads, etc.
I haven't used a modern TV in a very long time, but I can't imagine LG is extracting over $20 in ad revenue/data revenue per year. It might move the needle on <$500 displays, but when LG displays costing over $5,000 still have this spyware its hard to defend.