I was able to root my Samsung TV easily with Codex, disable updates and spyware, MITM everything with the eMudhra certs. The problem is no one really knows what these TVs do, they're all liars with 100 page privacy policies that will legally allow anything, and encrypted HTTPS communications that we can't even ordinarily monitor what they're sending. They can be updated at any time to start sending more or less data without your knowledge. So I feel the only realistic option is find a TV that can be rooted and do that. If you root a TV, you can fully disable network access and then use an Apple TV, or use the TV's software with MITM and deeper analysis with AI to disable snooping.