There are no ads on my AppleTV. Maybe this depends on which apps you have installed - Apps get to put content (usually stuff you're in the middle of watching, or new shows) on the AppleTV home screen. Perhaps some are abusing this privilege?

I’ve seen no ads on my AppleTV, other than what apps/services show me.

However, each app in the top row gets to populate the top half of the screen with its own content. I primarily use Netflix, which just displays the shows I recently watched. Maybe other apps are showing you the ads you’re seeing?

What do you consider "Ads"?

Did you see new movies on different services and consider those as ads?

Or did you get ads for a new detergent and the local grocery chain?

There are no ads on the Apple TV.