Swiss person here. Over the last 2 weeks, dozens of my contacts (often total non-techies) have installed Threema and/or Signal. I've heard of a lot of family chatgroups moving away from WhatsApp.
WhatsApp has near-total market penetration in Switzerland. I hope this will change now, at least a bit. Until recently, you'd get strange looks if you mentioned that you don't use WhatsApp. (People sometimes assume that means you don't own a smartphone.)