Is Telegram Really an Encrypted Messaging App?

• Telegram is often labeled as an 'encrypted messaging app,' but this is misleading. - Default end-to-end encryption is not enabled; users must manually activate 'Secret Chats.'
• Secret Chats are only available for one-on-one conversations, not group chats.
• Telegram's encryption protocols have been criticized for being difficult to use and not industry standard.
• Despite these issues, Telegram markets itself aggressively as a secure messenger.

Source: Crypto Engineer