this post was submitted on 19 Aug 2023
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Why do people choose Telegram over Signal? Signal encrypts everything by default, unlike Telegram which only "encrypts" messages in a (iirc) secure or secret chat. Fortunately, EU is forcing all major gatekeepers' messaging apps to be able to communicate with other messaging apps. I, finally, will be able to break free from WhatsApp and use Signal. Uninstalling WhatsApp and requesting for a deletion of my account; a dream come true soon.
Why use Signal over XMPP and Matrix? Signal is centralized and wants you to stay in check, using their crappy client, giving away your phone number, and all your presence, social graph and other privacy sensitive information to a single actor (which can't be yourself, because you can't self host signal) and that has nothing to back it up other than "trust me bro, I'm gonna do no harm, but also I control all your communications under my own terms and conditions and there's nothing you can do about it".
Signal is an installable App from an app store.. Where's your matrix and xmpp? That's why they use it over element/etc
XMPP arguably has some of of the strongest crypto functionality there is, it's just too dependent on the app to feel safe, since all of the vulnerabilities in these ecosystems are basically down to the client implementation.
Absolutely, and an argument can be made about captive ecosystems controlling both clients and servers. They also represent a single point of failure, so there's no magic bullet. In practice it's also not that different than keeping up with your browser's/OS'/phone's updates and XMPP has that for itself that it has (unlike Matrix) a vibrant community of clients and servers supported by diverse parties (commercial and not).