https://thenextweb.com/apps/2020/05/04/google-duo-calls-may-soon-work-without-a-phone-number/

Google Duo is one of the simplest apps for making video calls with friends and family, but it’s been limited by the fact that it generally requires a phone number to use. Frankly, I don’t want everyone to have my phone number. It now seems Google is changing that requirement, thanks to a hidden change in the Duo app spotted by developer Jane Manchun Wong.

— Jane Manchun Wong (@wongmjane) April 30, 2020