China, no. Wechat.
Japan, no. Line.
S. Korea, no - Kakaotalk.
South East Asia: Whatsapp, yes.
It is interesting.
Thailand: Line.
Thailand also heavily use WhatsApp as well.
Also Messenger.
Yep, definitely. I just know when I moved there one of the first things I was told was "install Line" and I got to smile and say "I've had line for years." (because I collect social apps for fun)