While I love my LG tvs, they have had ads on their smart tvs for nearly a decade.
The difference from Samsung is that the ads on the LGs are in the same place they've always been (on the smart tv menu overlay), they've never been obtrusive, and they're always in some way connected to video content (usually VOD movies that you can purchase through one of the streaming apps, or adds for streaming apps you can install on the TV).
My old LG "smart" TV would send a web request to LG every time I pressed ANY button on the remote control.
I took that stupid TV off the network as soon as I could.
I think the manufacturers are all as bad as each other. My current Panasonic TV will refuse to load any of the "smart" apps (even Netflix) if it cannot reach Panasonic's servers, which means the entire TV becomes useless as an Internet device (no Netflix or ANY streaming services) if Panasonic has a server issue (which they sometimes do).
I'm extremely happy with my HiSense - it runs Roku, so the "smart" stuff is actually maintained by a company that does a pretty good job of it. The only thing you could call ads are promos for shows. I think their revenue is kickbacks from subscriptions people get through Roku, rather than direct advertising.
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.
Just disconnect it from your network (change the wifi password or remove the Ethernet cable) and it will be unable to auto-update.
You may want to get an external device (Roku, Chromecast, Apple TV, or other media server) and plug that into your HDMI if you use the network from apps on the TV.
Just wait 'til they get a blanket connection to Amazon Sidewalk for their nefarious deeds, and the only way to disable it will involve a soldering iron.
What can the apps on your TV do that a $40 Amazon Fire stick ($50 if you want 4K) can't?
I'd rather hook up an old laptop to my TV and use that to watch media than use the apps on my TV and deal with all the bullshit that TV manufacturers are doing when you connect the TV to the network.
That's who i bought a Panasonic. They cost more but don't have a shitty track record. In fact, my washing machine was the last Samsung here. It broke and got replaced by a German machine. These days I try to avoid the cheapest offering and try to buy quality instead. Upfront cost is higher but I really value my time too much to bother fighting with nonsense like ads on my tv.
I have a Panasonic TV too. Back like 8 years ago, it had an unremoveable ad/app square in it's app menu. Of course, they let me reorganize the apps, and I put it way back on a screen I'd never see, and I haven't noticed it since.
Also, as a side note, Vudu is like the one app from that era that still works.
Does your Panasonic stop loading any smart apps if their servers go down too? Mine refused to load anything (eg. Netflix) if it can't get in touch with Panasonic.
Check what network activity it is engaging in. You'll be disappointed, I am sure. Seems dialling home is the new thing to do on every single device these days. Data vacuuming the entire human population just because they can.
I agree, if we have to have ads for whatever reason, do it in an unobtrusive way that the user is asked about during setup. Now the ads in lg's smart home app are a different matter...