It's not a matter of "cheap", even the high end Sony TVs have spyware on them by default. The best thing you can do is get Claude or Codex to adb into your TV and uninstall all the malware, then keep it disconnected from Wifi and use an external box like Apple TV to watch.
Just disconnecting from Wifi often doesn't work because the TV will connect to insecure wifi to upload data and fingerprint what you're watching and who you are.