If you don't want a TV that doesn't track your viewing habits, force automatic software updates, show ads, and do other objectionable things while claiming it's "smart", don't buy one.
Well yeah, those TVs are cheap because they use crappy panels and get subsidized by ads. If you just want a cheap panel and driver, you can message a wholesaler on panelook and buy them for like $200 plus some change for a sound bar.
A fast 4K monitor costs ~$700 because it’s a much better product.