There was another thread with a paywalled article, but here's the actual study that found that smart TVs use "automatic content recognition" to build an ad profile for you based on what's on your screen... including HDMI content streamed from a laptop, game console, etc. Yikes.
At a high level, ACR works by periodically
capturing the content displayed on a TV’s screen and matching
it against a content library to detect the content being viewed on
the TV. It is essentially a Shazam-like technology for audio/video
content on the smart TV [38]. ACR is implemented by all major smart TV manufacturers, including Samsung [9] and LG [55 ].
Our findings indicate that (1) ACR operates even
when it is used as a “dumb” display via HDMI; (2) opt-out mecha-
nisms stop ACR traffic; (3) ACR works differently in the UK as com-
pared to the US.
So it seems like you're opted-in by default, but you can stop ACR traffic by simply configuring six different options on Samsung, or eleven different options on LG.
Oh, and this doesn't seem to happen when you're using native streaming apps like Netflix or Disney+, because hey, they wouldn't want to infringe on those companies' rights by spying on them, right?
No idea. My closest neighbour is 250 m/820 feet away, so not something I need to think about.
You’d be surprised. I have one neighbor across the street and my next closest is a quarter mile up the road. I still see multiple Wi-Fi signals to connect to, 2.4GHz wifi can travel way farther than you might think.
Best to let it have an IP but block WAN access so it can’t leave the home network. This also keeps the TV from complaining about not being connected.
There's probably lots of situations in anything but rural environments where open Wi-Fi networks are either already available, or highly likely to be. Dorms, apartments, anything like that becomes a mess.
Yeah. I’m in the rurals and at any given time can see between 5 and a dozen networks. Years back when I was apartment living, there was a ridiculous number of networks in range, couldn’t even give you a count.
If you’re curious and have an android phone or tablet, check out WifiAnalyzer. It gives a graphical view of nearby Wi-Fi networks, channels they’re on, signal strength, and so on.