It's worse for me in my country, 90% of people use Viber. Which not only has the same lack of privacy with other popular messengers, it's also ugly, filled with ads and company bots, and it's obviously targeted to teenagers. It's so weird to me that people use this app, but I guess most people's choice is always "whatever my most contacts use". I've been trying to introduce my friends to something better, I would prefer Signal but literally zero of my contacts use it. On Telegram on the other hand, I found 4-5 of my contacts already using it so I started from there, added my family too, and I'm slowly trying to add more friends. Until then, like others said, I'll use whatever for a casual message, and I'll just call the person for anything more personal or private.