I’m from Mexico, and the most used chat application is WhatsApp. It’s used for EVERYTHING. I use Telegram only for contacting my family members (both my parents and my brother). They also use it only for this family chat. All my (and their) contacts use WhatsApp instead.
Now with the news that Telegram will collaborate with Twitter, I feel that I should delete it. Not that Zuck is any better than Musk, but still…
Also I don’t think it’s worth the effort to teach my parents yet another messaging app, like signal.
Despite being in the hands of the zuck, whatsapp is more private and secure than telegram, and not because of any collaboration with X/twitter, it’s been that way forever… so go ahead and use it (but if you can, signal is even better on that front).