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Of course, my observations are limited to me and I don't have any numbers. My interactions are with people in Brazil/US/UK/Australia/India/South Africa/Kenya/Spain/Central America.

I know WeChat is more popular in East Asia, and I know a few Telegram/Signal users, but I can find about almost everyone on WhatsApp.

When I was in the Nederlands last year they actually had public signage advertising a WhatsApp group chat (for emergencies and the like) for the surrounding community.

I was surprised by how popular it is.

I'm from Brazil, live in the Netherlands. Whastapp is ubiquitous in both places. Not using it today is akin to not having a mobile phone years ago.

My friends from Germany, Switzerland, and France all primarily use WhatsApp I've no idea why.