No one said it is forced. It ia relatable to me as I live in East Europe and all my people use WhatsApp. It really is the main way of communication.
Businesses also use WhatsApp. Like boutique or handmade good stores, to have special requests or, for anything you can name as a conversation.
We have family group in WhatsApp. Any special occasion or events, we communicate on that group.
Like, 10-15 years before, it was MSN or equivalents. It evolved to WhatsApp. Telegram, too.
edit: Sorry I misread the title :) But I still don't think people are forced to use WhatsApp. This is the way it goes.
Isn't it so cool? It keeps me motivated to argue.