I installed an AppleTV recently, so I don't have much experience. But the first thing I saw after the initial setup was one/third of the display advertising a TV-show on a subscription service I had to purchase. Would that count as an ad?
On the Apple TV you get ‘ads’ for the apps you have in your top row, with different levels of interactivity. Some are just logos of that streaming service, some show recently watched. The Apple TV app has full-blown ads for Apple TV+ originals.
They won’t actually let you delete the Apple TV app, but if you move it out of the top row you will never see the ads.
My parents have an Amazon Fire TV and when I go to their house and have to use it it drives me insane. Carousels of adds large at the top, banner ads as you scroll, full rows of sponsored apps. Full screen ads for random Amazon products when you pause any show you are watching. Everything you watch on Amazon’s streaming service has minute long unskippable ads. Sometimes when you turn it on Alexa will just verbally read you ads.
It’s truly a dystopian piece of tech.
Apps placed in the top row of the app grid get to display content at the top area, when that app is selected. Most apps use it for things like continue watching or show recommendations.
That’s very different from turning on your TV and seeing an ad for Mercedes or whatever taking up the screen.