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Volunteers do free work to make all of the language content so it shouldn't be.

That doesn't make it not copyright infringement. Either the volunteers retained ownership of the content they produced, in which case this is infringing on their copyright, or they assigned it to Duolingo, in which case, Duolingo's.

> so it shouldn't be.

I specifically framed it that way so that the WELL AKSHUALLY crowd wouldn't say what you just said.

> but isn't that copyright infringement

And your parent comment specifically framed it to ask whether it is, not whether it "should" be, so the response to you was hardly a "well ackshually."

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