There was a clear opportunity in this segment.

Originally shared by Jazli Aziz

There was a clear opportunity in this segment. Skype came at a time when people did video calls on their computers, but it never really took the mobile market seriously. Duo capitalised on that and is now enjoying much success.
http://www.androidpolice.com/2016/08/25/google-duo-downloaded-5-million-times-android-since-release/