On my old Samsung TV, if I inadvertently push the "Smart Hub" button in the center of the remote, the bottom 20% of the screen gets overlaid with what looks similar to a MacOS Dock with the default apps from 2012. Worked OK in 2012 when I bought it and used Netflix a few times, but a month later I bough the original Google Chromecast, plugged that into HDMI 1, unplugged the Ethernet cable, and never intentionally pushed the Smart Hub button again.

I didn't push it again because in about 2015 I found that if you push it, it locks up for exactly 30s, which is how long it takes to hit the network timeout and say "Updates are available for your Samsung Smart TV." and then allow you to use the ancient web browser or Netflix or other smart apps. I did try a couple years ago, on a whim, but apparently the update servers have moved and even when plugged into Ethernet it can't actually update.

Everything currently runs through the Roku, the Blu-ray player, or a component-to-HDMI dongle for the Wii, but if I didn't have the Roku I'd have a motivation to update so that Netflix would work without a 30-second delay (and I'd be unsurprised if Netflix wasn't backwards compatible with their 2012 client from a Samsung TV). However, the picture is fine, so it keeps on chugging.

Think of it as unpatched computer on your network, possibly with a built in microphone and camera.

My Samsung TV auto-updates. It's infuriating as I cannot disable it.