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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.
You switched from a system that is currently shitty (Fire TV) but easily replaceable (just an HDMI addon) to a system that is currently less shitty (LG TV) but now you are firmly locked in into the LG eco system.
As bad as FireTV currently is, at least you can easily ditch it. Just pull the plug and buy another brand of TV stick.
If you keep relying on your smart TV apps then you will have to endure the slow shittyfication for years to come.