Email, docs, music, maps etc have reasonable alternatives and you don’t depend on others to switch (a gmail user will receive my email from tuta). But with WhatsApp either you conceal and use it or you just don’t talk to people (tried convincing them to switch to signal and it simply doesn’t happen)
How do you deal with it?
You’re in a lucky part of the world. In my area, Whatsapp is used a lot for sharing attachments mainly, e.g sending a photo of a receipt for claiming warranty, contacting government officials, etc. People here do understand that if I say I don’t use it, and even though they agree to use SMS and email, it still slightly annoys them as it is out of their norm. I am living by till now without Whatsapp, but it’s really difficult.