I have a Samsung TV that I suspect does this. Once upon a time (back when I was less knowledgeable about this practice) I connected my TV to the internet. I have since been totally I able to forget my network from the TV, even a factory reset didn't wipe the network settings from it. I've had to block it from the network at a router level.

I only discovered it was still doing this when I got a new router, and I had a popup on my TV saying "software update downloaded and complete" and I was wondering how tf it did that even though I'd gone through the process of forgetting the network, and seemingly the settings showed it had been "done".

Shady fucks.