Additional advertising is unwelcome
So on the apps, now when you complete a new lesson instead of just saying "well done, here's some gems", it's not as encouraging - instead of a "congrats you learned something", it just immediately suggests you watch a video.
It'd be better for learning if you got a congrats before the video pop up.
Although I respect the content is free and advertising is necessary, I feel it's worth feeding back on the nature and presence of the advertising.
Ah yes, don't complain. You don't have the right to, because it's free.... What baloney.
I agree advertising is necessary to pay for most of the content I enjoy, but Duo founders themselves say they considered the way in which they place advertisements is important. The video suggestion could be formatted better - it would resemble the other advertisements, which are placed after the notification saying you've successfully refreshed the lesson.