Half of the people I regularly talk to are on WhatsApp. I don’t like it but that’s reality, it’s hard to get them to migrate because this means that people THEY talk to would have to do the same. Also a good chunk of them use rakuten Viber. Now why do they use THAT? It’s bloated, ad-ridden, and buggy. Almost nobody I know is on telegram. In fact most are still using Facebook messenger.