Although (NASDAQ: ROKU) shares are up 72% this year, outpacing the broader Nasdaq Composite Index by a wide margin, they remain 85% off their all-time high. A general slowdown in the streaming and digital advertising industries, coupled with investors moving away from riskier stocks, has certainly hurt Roku shareholders. 

But investors who believe in Roku's long-term prospects can't forget about a key element of the business and its success. In fact, it just might give you the optimism you're looking for right now.  

Along the same vein, a magnificent competitive advantage might make this streaming stock a screaming buy. Let's take a closer look.  

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Source Fool.com