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Whatever the business model is, it's working. Data from ComScore indicates that Roku controls an industry-leading 37% of the United States over-the-top (non-cable) connected-television advertising market. In a similar vein, media market research outfit Parks Associates reports that Roku accounts for 43% of the country's actively used media-playing devices, topping Amazon's comparable FireTV tech. Roku hasn't yet put much focus on foreign markets, but where it has, it's gotten respectable traction there as well.