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?
I managed to do a surprisingly good job convincing a decent chunk of my friends to move over to signal several years back and they’ve mostly stayed. I still have WhatsApp but it’s a much more secondary chat app for me now days.