It sucks. Here in the Netherlands, WhatsApp is used by the
vast majority of people. The holdouts (like me) consist of people who don't want to deal with smartphones (some elderly, some who deliberately avoid them because of addictive behaviour), or who own a smartphone, but don't agree with WhatsApp's terms of use (essentially paying for access with your data).
Not using WhatsApp has consequences. We sometimes miss out on family events when people forget that we don't use WhatsApp. Anyone with children is basically required to use WhatsApp for communication with other parents, organising school and social events, and what have you. Refusal to do so means you ostracise your kids.
So yeah, great. To participate in some parts of society WhatsApp is now a de facto requirement. A whole nation blindly agrees to whatever terms of use Facebook drafts. And when you do accept those terms, you are forced to use their client software on one of their approved operating systems. Owning a (Android or Iphone) smartphone is a hard requirement.
The network effect means that alternatives never gain any traction, and the price of WhatsApp ('free') is hard to beat.