Yeah, same here. In Germany WhatsApp is extremely dominant. I tried to move to Threema, but only a couple of people are using it in the end, even after discussing the whole Facebook thing. Some people are also on Signal, but again, only a few. In the end, especially for groups, I still have to use WhatsApp.
You can find it at the githyanki crèche, the „general“ with the two dogs had it. I sadly fed it accidentally to my group during a long rest