2. Sly TVs never get Internet access in my house. I don't plug Ethernet into them, and I don't set configure their wifi. If I must give one access because it needs a firmware update to fix a bug or something, I temporarily set my guest wifi network's password to something random, configure the TV to use that, apply the fix, then reset the guest wifi password back to the old value.
3. I trust literally any other video device in my house more than a sly TV. While we use Apple TVs, there are plenty of excellent alternatives that have reputations for being decent about privacy. Apple hasn't been sued for spying on my TV watching; Vizio has. The FBI hasn't warned me about Apple.
4. All sly TV OSes are junk with terrible apps. Seriously, slap an Apple TV (or Roku or Fire Stick or ...) in the HDMI jack and your viewing experience will be better in every way. I'm not suggesting you make your TV worse, but to make it much, much nicer.
I don't want to come across as paranoid, but sly TVs have a history of one headline after another of reporting your viewing habits, injecting advertising, and otherwise bringing spyware into your living room. This isn't some big new explosive revelation, it's a normal Tuesday in the news. Don't put up with it! There are much better alternatives.