Certainly not in Denmark. Most people I know have iPhones and I use iMessage with those. If they don't have iPhones iMessage will send them a text which is included for free in all subscriptions here.
I only use WhatsApp for people from other countries where it apparently is popular? I don't really see why - the app is not very aesthetically appeling. In fact its damn ugly.
Stop assuming that because something is like this and this where you live that it is universal.
I live in the US and only use iMessage, have never touched WhatsApp. Stop assuming you know me