I have ads on my Apple TV, don't you? Some movie trailers running in the background that I really don't want to see. And every time I miss-swipe somehow the Apple TV remote in an application, I get to that "home" screen watching another movie trailer :|
No. I don't use the "TV" app though, so that may be the difference.
Unless you mean trailers for whatever the cursor is on, inside of an app like Netflix? If so, some of those can be disabled, but I actually like them—they're "ads" for content that I already have access to but may not have known about otherwise.