What exactly changed during the years that readlang was owned by duolingo, and what was the impact on Steve buying it back?

General
1

I am curious as to what duolingo had to do with readlang.

2

It was basically an aquihire, meaning that they wanted me more than the project, and it remained in maintenance mode the whole time it was owned by Duolingo. I wrote a bit about it here: I Bought Back My Acquihired Startup