"Fitbit has been a painful stock to own. After going public at $20 in mid-2015, the stock rallied to nearly $50 before tumbling to just over $5 per share. The reasons for the decline were easy to see -- slowing sales growth, plunging margins, and a lack of a moat against cheaper fitness trackers and full-featured smartwatches.
I discussed Fitbit's possible future and its four main competitors in two recent articles. But today, I'll examine three specific market trends which should trouble Fitbit's long-suffering shareholders -- the growth of wearable apps, the evolution of smartphone chips, and ongoing questions about the safety and accuracy of its devices."
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