Some of those bundles had the HBO and Cinemax channels but not Showtime ... there are smart TVs and media players like Roku's devices that allow you to download any of the more popular services. With ...

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Max and Starz are joining forces in a new streaming bundle launching on Prime Video in the U.S.

Perhaps the biggest threat to Roku comes by way of Walmart's recent deal to buy TV manufacturer Vizio, and its Smartcast OS, according to one analyst.