Music Business NewsreCAPTCHA and Duolingo: Luis von AhnDigital and Radio FactsMay 24, 2020May 9, 2026 by Digital and Radio FactsMay 24, 2020May 9, 202607 Luis von Ahn created CAPTCHA to solve Yahoo's spam problem, then evolved the concept into Duolingo, now valued at $1.5 billion....
