[budgefrankly]

Telegram isn't even encrypted, at least not in the sense of the on-by-default end-to-end encryption used by WhatsApp, iMessage and Signal. In reality its selling point is that your chat records are placed in foreign jurisdictions so your local police can't easily access them.

https://blog.cryptographyengineering.com/2024/08/25/telegram...

Ultimately the only way to be completely sure is to use an open-source app like Signal that you've either built yourself from source you've inspected; or sourced pre-built from someone you trust.