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Amazon is now automatically playing fullscreen video ads on Fire TV
(9to5google.com)
This is a most excellent place for technology news and articles.
Roku is more closed than Amazon fire. I've read about rooted Fires.
Apple TV seems the least intrusive right now but I've never used one personally.
I've had an AppleTV for about five years+ now and have yet to see an ad placed on the main screen.