Are you serious? Everyone and their grandma in India uses WhatsApp. It's so pervasive that it's almost like the only means of communication for people with smartphone and internet access.
I'm pretty sure you made up every claim you just wrote. Why would you bother doing that?
Notably - as you mentioned - Wechat in China, but also Kakao in Korea, Zalo in Vietnam and Line in Japan and Taiwan, where very few people use Whatsapp.