It works for some people, clearly, as stated by some on this very thread. I hope you will not move from "Duolingo is useless for everyone on this earth" to "any

It works for some people, clearly, as stated by some on this very thread. I hope you will not move from "Duolingo is useless for everyone on this earth" to "anyone saying Duolingo is useful for her/him is in denial"...