[birksherty]

Whatsapp is dominant in most countries in world, it's not overstating. Your 3 country example mean nothing in comparison.

[omnimus]

If by most you mean 50% then sure. But the other 50% countries prefer to use different app. Be it Facebook Messenger or Telegram... In my eu country nobody has WhatsApp and its not uncommon. Network effects are at play so it's what became popular first.