Eventually every smart TV becomes dumb when they inevitably shut down the backend services.
Except that on newer tvs all the nagging will still be there, all the ads will be "frozen" in time (mine has ads for stuff from 2023, the last time I connected it for some firmware update that _GASPS_ actually fixed some things) and some features may depend on internet connectivity. The manufacturer may care to release a final update and solve these issues, but you know they are much more likely to fraudulently just disable features that worked offline as a last middle finger.
Repeat with me, SaaS is fraud. Proprietary digital platforms are fraud.
They quite literally have settings to disable that. There are no ads in the operating system.
https://support.apple.com/en-au/guide/tv/atvb66239fa1/tvos
I'm sure some conspiratorial thinking would lead people to the conclusion that Apple are secretly tracking and selling data. There is no evidence to suggest this is happening.
It's probably the next best thing to setting up your own linux home theater PC. But that comes with trade-offs with UX and DRM blocking 4K streaming apps and lack of Dolby Vision playback.