I installed WhatsApp for the first time in my life just a few days ago because I needed it to communicate with some event organizers at my current holiday destination. Once I'm home again I will uninstall it again and will probably not have a need for it before I travel somewhere else where it's used.

For the record, I am from Denmark which is in the EU. If people here use WhatsApp they are either expats or they need it to communicate with foreigners.