You would be right if the telegram developers haven't started with ridiculous security claims ("military-grade", "unbreakable"). Their marketing implies you can

You would be right if the telegram developers haven't started with ridiculous security claims ("military-grade", "unbreakable"). Their marketing implies you can use telegram for sensitive communication, which in practice you can not. If you are a political dissident and use the app, you might get jailed or killed due to the fake sense of security. Secure IM is not for hiding your diary from your sister any more.