The founder of the secure messenger Signal, Moxie Marlinspike, said that the security of Telegram is a myth, but in reality, in terms of privacy, it is less reliable than WhatsApp.
Messages sent via Telegram are stored on the messenger’s servers in their original form or in plain text, without any encryption to protect personal data. This means that a person who has access to Telegram services has direct access to the entire database of unprotected user data.
In this regard, even Facebook Messenger and WhatsApp have a higher level of data protection. Both Meta applications offer at least end-to-end encryption for all text messages sent through their platforms.
If a hacker or government agency who suspects you of a crime is interested in spying on you on Telegram, they can easily do it, says Marlinspike.