Ok, valid argument: telegram servers DO receive and store plaintext version of every conversation done (except private chats), while, as a reference, whatsapp don't do this, applying end-to-end encryption by default.
So, basically, hack telegram servers -> you have all the convos. Bribe some employers, locate and grab their servers -> see above.
Also, how would you know they're not connected with some 3-letter agency already?
FWIW - I have no way of verifying this - Telegram says they try to work around this by (IIRC) :
- Using some kind of crypto with multiple keys
- These keys are located in multiple independent datacenters in independent jurisdictions
According to what I read this was supposed prevent leaking of user data just by bribing/coercing/etc or suing any Telegram employee or datacenter provider.
As I've mentioned before I don't use Telegram for security, I use it because
1. Facebook failed its Whatsapp acquisition so badly
2. It is way more user friendly
Also keep in mind that when I left WhatsApp for Telegram WhatsApp still didn't have e2e.
