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Good on Signal, but what's the problem with Telegram?
Telegram isn't encrypted end-to-end by default; apparently if you do encrypt e2e you can't access chats from multiple devices.
Signal's protocol is widely understood to be the gold standard for security, which is one reason it's been adopted for multiple messengers. Telegram has a bespoke protocol which is not as well regarded.
What else uses signal's protocol out of curiosity
https://en.wikipedia.org/wiki/Signal_Protocol#Usage
Wow I had no idea it's what WhatsApp, Messenger, and RCS all use.
Not end-to-end encrypted by default, ad-financed, stores data and ecryption keys centrally, analyzes messages while they're being typed etc. It isn't really any more secure than even something like Whatsapp.
Encryption sucks and used to be a complete joke when it started