Yes, the reason is that it takes around two years before a user realizes how ineffective the site is. That’s about the maximum amount of time a user can fool th

Yes, the reason is that it takes around two years before a user realizes how ineffective the site is. That’s about the maximum amount of time a user can fool themselves into thinking “I’ll start to see some progress any day now!” If Duolingo were as effective as sites that require the user to make actual effort, its popularity would be more than justified.