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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.
The Roku does nothing at all better than the Nvidia Shield. Roku also has giant ads you can't get rid of. They recently blocked the few workarounds people found.
Honestly, you could just flash the fire stick. That might be the cheapest and most effective option.
The Nvidia Shield is $200. You might as well buy a used laptop, a nuc, or an old desktop at that point.
It also already had End Of Life for one of its key features - Game Streaming. So I am convinced it will be supported for much longer.