Some brands/models can't even be setup without an internet connection and setting up accounts (and sometimes credit card information). Eventually, they'll probably have their own independent 5g connection.
I can't remember the brand. I think it was one of the cheaper Roku tvs produced by a Chinese company I saw when I was looking for a replacement for my parents (reminds me of the issues with Onyx Boox devices).
At this point, I just assume everything is spying.
(Just because you're paranoid doesn't mean they're not out to harvest your data, I guess.)
