From my personal experiences, international countries that have smartphone adoption use Viber, and the feature phone countries use WhatsApp.
From my personal experiences, international countries that have smartphone adoption use Viber, and the feature phone countries use WhatsApp.
So, WhatsApp is definitely used in high-profit markets as well.
Source: http://www.nu.nl/tech/3506473/whatsapp-heeft-kwart-miljard-a...
WhatsApp users are mostly not early adopters like you and your friends. They are ordinary people, because WhatsApp is is a simple communication tool targeted to everyone. And that's why they keep doubling their user base.
It has basically replaced texting. Even my mom use it, which for me it's the definition of "wildly popular".
WeChat - china
S Korea - kakaotalk 90% market share
LINE - Japan 50 million users with 300 million worldwide
And all three have significant revenue in double digit US millions a year, unlike WhatsApp which has no real revenue...
As far as I know, both are very profitable through sales of digital goods like stickers etc.