Anyone use Duolingo with their kids? Mixed results here

We've been using it for Spanish with our 7yo and she actually enjoys it, which is surprising. But it's gamified as hell - she's more interested in the streak than actually learning the language lol. Still probably better than nothing? She knows like 50 words now which is more than I knew. Just wondering if anyone else has seen actual results with the app or if it's more of a "keeps them busy" situation.