Why I'm Not Buying Duolingo Stock

Language learning app Duolingo (NASDAQ: DUOL) provides investors with a lot to like. The company's revenue was up 129% year over year in 2020. Its gross margin is expanding, increasing from almost 71% in 2019 to almost 72% in 2020. And it's already free-cash-flow positive.

It's rare for a young company to combine high growth with profitability as Duolingo does, so it's easy to understand why investors are excited about this stock. But there's a big problem I see with businesses that profit from language learning, and it's why I won't be investing in Duolingo anytime soon.

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Source Fool.com