I'm well outside the US (Eastern Europe) and have never needed WhatsApp. I can talk with all the people I know over Google Hangouts or Facebook Messenger. Perhaps it's also an age thing? I guess the youngsters use WhatsApp.
You couldn't be more wrong. I've lived in Czechia, Poland, the Netherlands, and the UK. I've played go competitively at a European level and have travelled a fair bit and socialized with nerds all over. Name a European country, chances are I know several people there.
How far east are you?
I'm from the Czech Republic and often spend time Poland. No one I know forces me to use WA or Telegram, everyone's either on G Hangouts or FB messenger.