Telegram can be confusing for users. Encryption needs to be turned on, and isn't available in group chats.

https://www.ieee-security.org/TC/SP2017/papers/84.pdf Is super interesting when thinking about secure messaging from the perspective of ordinary folk.

This has been discussed before. Read these two threads:

https://news.ycombinator.com/item?id=6915741

https://news.ycombinator.com/item?id=10713064

Since they use their own in house crypto, most people don't consider it trustworthy:

https://security.stackexchange.com/questions/49782/is-telegr...