[throaway5445454]

See, that's my issue. If Duo is only a good way to "get started," then it isn't a good way to LEARN a language, as in learn how to actually use it to a level approaching fluency. The whole thing is false advertising, not because of the specifics, but because of the advertising which makes people think (and yes, millions believe(d) it) that you can become fluent by using Duolingo.

[projektfu]

It's all false advertising. Rosetta Stone was the pinnacle of false language program advertising, but the rest just take their cue from that.

A part of what I was saying, which didn't come across, is that I think Duo lacks a way to get people to move on. Being "free", there is less incentive to give it up when it stops having a benefit. Eventually it becomes a daily accomplishment, like doing the Wordle, that doesn't really improve anyone. That doesn't make it bad, but it hinders progress at learning a language.