Basically it's because I don't think Duolingo wanted the product so much as they wanted me. No-one used the term acquihire at the time but I was under no illusions that that's what it was.
I did think that I might push to develop Readlang at Duolingo, but it never seemed like an attractive proposition for a bunch of reasons. I think it would have needed to grow at least 100X to start getting interesting within Duolingo. Not to say this was totally impossible but it seemed like a tough job. Also, some of the things that Readlang does, like browser extension and public sharing of texts, feel a bit "wild west" compared to the rest of Duolingo which is more curated and controlled, so it's not clear exactly how Readlang would have needed to change to fit in. I figured that if I tried this and integrated it tightly within Duolingo, and then failed to grow sufficiently, then the risk of it ultimately shutting down would have increased.
Also, I had other exciting projects to work on there which seemed more valuable for Duolingo, and therefore better for my reputation within the company, so I was happy to work on those!
I did think that I might push to develop Readlang at Duolingo, but it never seemed like an attractive proposition for a bunch of reasons. I think it would have needed to grow at least 100X to start getting interesting within Duolingo. Not to say this was totally impossible but it seemed like a tough job. Also, some of the things that Readlang does, like browser extension and public sharing of texts, feel a bit "wild west" compared to the rest of Duolingo which is more curated and controlled, so it's not clear exactly how Readlang would have needed to change to fit in. I figured that if I tried this and integrated it tightly within Duolingo, and then failed to grow sufficiently, then the risk of it ultimately shutting down would have increased.
Also, I had other exciting projects to work on there which seemed more valuable for Duolingo, and therefore better for my reputation within the company, so I was happy to work on those!