I'm less worried about the "vibe coded" than "vibe-language-learning"

Though I do think there is vast potential for such things, it needs to be approached judiciously.

From trying it out, it's definitely vibe created because both the pronunciation and wording it provides in a language I know are wrong.

Duolingo (at least for the same language) has correct pronunciation and grammar/words, even if it's not a good way to learn.

It's vibe coded because every button looks different.