@Kinal,
When I used Viber for instance it was hacked as I started to receive tons of spammy messages, I was added to different group chats with people I don't even know and messages were sent from my account by themselves. Then I switched to Telegram which seemed to be more secured but I got tired of all the bug, connection problems and security questions.
That's why I think that blockchain messengers can be a good replacement for all that old stuff.