Simplistic comment, black and white thinking, it's not easy.
A majority of Americans have iPhones, easy, they have iMessage, in Europe the majority have mobile phones running Android, there's no iMessage for Android, so, Whatsapp got huge.
I told all my family, friends, colleagues and others I quit Whatsapp a few weeks ago, I got a storm of negativity.
Most people do NOT know it's owned by Facebook, most people are not aware by the evil dirty game Facebook plays, most people don't know of all the Data breaches, most people are too blind to see the damage Facebook (and Google) do.
Luckily there are smart people, like the ones which made the current internet, they too say there's a need for a reboot of the internet, a so called version 2.0, your private data should be yours and yours only, should be on your device(s) like a server, you grant or deny acces, even after granting acces you could still change your mind.