Duolingo was under pressure post-earnings after it said its drive to gain subscribers would mean slower earnings growth and narrower profit margins in the short term. The language-learning app company said it would step up investment in artificial intelligence and sacrifice some degree of monetization in order to accelerate user growth and engagement, with the goal of doubling the current number of daily active users to 100 million in 2028. Duolingo Co-Founder, Chairman, President & CEO Luis von...