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Finally got rid of telegram, congratulations to me
(sh.itjust.works)
It was a many months transition, and it's finally done
Fun thing, you can actually make a backup of all* your messages, groups, contacts, etc. So before leaving you can have all of your data in case you need that one contact or something
The final red flag was as that allegedly Russian authorities were messing with people's deleted messages. Not for the first time there are news that they could read, modify, delete, see location, and etc. Screw it, this is unsafe, I'm out.
Also, these days telegram is really at the state of a pile of garbage, bloated, buggy, and shady messenger.
Afaik the protocol is documented[1] and the clients are open source[2].
No code available for the backend though.
[1] https://core.telegram.org/mtproto
[2] https://telegram.org/apps#source-code
Ah well, my bad, things have changed since last time I checked.
So better of what I thought, but still not great. Also the fact that it's a Saudi Arabia company now (where they are not exactly famous for their human rights protections) does not bode well.