Fluent in Weird. the heart system has long been one of Duolingo's most controversial features 😬 initially, Duolingo said it was designed to discourage binging but come on... we all know EXACTLY what it's for: it's designed to get free members to become paying members and how does it do this? by punishing mistakes eek but (at long last) it seems that might be about to change... 👀 Sponsored by: 1440 News. Without Motives. That’s 1440 Over 4 million readers rely on our 5-minute newsletter for a...