Well you have the right to remain silent. So there’s that.
Beyond that though I’m not really sure. I thought it was fairly clear in the US for a persons rights, but you guys are all over the place these days.

Like a carbon monoxide thing?
I don’t think you forget uninstalling your web browser.

Not at all, no dumb questions.
Many Smart TVs do have modified software to show even more adverts than normal. Some of the built-in TV smart apps also have a lot of adverts. That’s why many people are recommending getting a proper streaming box/adapter instead of using the built in smart TV features.

Even on the official streaming devices there are “adverts”, but they are usually only for installed apps and they are more focused on their content and recommendations.
Though this does vary it seems.

It sounds like you have the right kind of plan. Main thing to know is that the Smart features on TVs are very much a “nice extra” and shouldn’t factor in to your buying decision as a £50 stream stick/box is usually way better.

The less you pay for the TV, the more adverts and worse experience you’ll get.
Ignore the smart features completely. Focus on the display quality and get the best you can afford.

Then get a streaming device. I recommend Chromecast with Google TV, only adverts I get are for shows (same recommendations the apps give me). Fire TV is also good, but more general adverts for Apps that aren’t installed. I’ve heard good things about Apple TV, but I don’t have any experience with it.
Get the latest streaming device and power using a socket, not the TV usb, and you can’t really go wrong.

It didn’t do anything. Usenet still exists and is active in some circles. It’s not very popular, but it’s as alive and well as it always was.