Roku (NASDAQ: ROKU) stock has been under pressure lately. Not only is the streaming company coming off an uninspiring fourth quarter, but news of Walmart acquiring smart TV maker Vizio likely also has investors worried about an increase in competition for Roku in the future. Even if it's part of a broader move for Walmart to go after rival Amazon, having the largest retailer in the world encroach on your territory simply isn't a great development for Roku.

But there are bigger problems Roku investors should consider besides what impact that deal will have on competition in the future. These are all reasons why the stock could struggle, and why the sell-off may still be in its early stages.

For a company to have strong growth prospects, it needs to have a moat, or a sustainable competitive advantage. Roku lacks that element. Its platform helps to consolidate streaming options, but it's by no means the only game in town. Other smart TVs also feature apps that can make it easy for people to access streaming offerings from Netflix and Walt Disney. Roku has simply been among the most popular options.

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Source Fool.com