[maqp]

"Are we sure it can't?"

No, there's a 1..2% chance of backdoor.

The real question is, why is Telegram more secure? There's a 100% chance it can read your group messages, because it says so on their documentation that describes the cloud encryption. There is no E2EE at all for groups. There is no E2EE at all for desktop. Together these mean E2EE are completely neutered and useless. I'm a privacy researcher and I don't use them at all. Why would an average joe?