The only concrete claim I could found is [1] - however, I admit, there is no further proof that this claim is true.
There are interesting discussions about the topic in [2] and [3], however even there are no addition concrete examples besides [1] - so, it might be that [1] is in fact how the rumor started.
> It's like the "TVs soon coming with a 5G sim" one,
Not yet, true, but there are enough signs that make such a development credible: Built-in connectivity over which you have no control is already standard for cars. Projects like Amazon Sidewalk show that vendors are clearly thinking about taking connectivity in their own hands. A large part of the value proposition of 5G is connectivity everywhere and a supercharged internet of things.
So I see this as the most likely trajectory for the future.
See also [4].
[1] https://forum.developer.samsung.com/t/if-you-choose-to-not-c...
[2] https://old.reddit.com/r/privacy/comments/bpr6xs/if_you_choo...
[3] https://news.ycombinator.com/item?id=25275350
[4] https://venturebeat.com/2019/05/01/huawei-reportedly-plans-f...
This is a myth that goes around HN as far as I can tell. Nobody's ever provided a concrete example of a specific TV model which does this. It's like the "TVs soon coming with a 5G sim" one, which people also speculate on.