>People don't really use SMS in Europe, do they

Europe is very far from being a single entity. Yet, SMS/RCS is popular enough, and in many countries WhatsApp is non-existent.

Actually I am european and use sms a lot. Dont even have WhatsApp installed... :)

Everyone has SMS, they may also have WhatsApp, Facebook Messenger or whatever is popular in any given market, but everyone has SMS.

I don't think I get any corporate communication from WhatsApp it is all SMS. For chatting WhatsApp is popular, but companies just send SMS.