I have nothing against Signal. I just don’t have access to a phone number right now. I fully intend to use the Signal when I get a number. I know there is no silver bullet, no absolutes in the privacy world but I’m looking for any messengers that are generally considered to be private and secure on Android that I can try to convince my friends and family to use. I have a mid - low threat model, it’s just the thought of giving the Zuck anymore of my family’s data makes my skin crawl.
Because the threat isn’t getting your number stolen, it’s about the content of your messages. While the goverment cóuld ask your phone number, they likely already have it unless you got a prepaid trow away that you keep replacing regularily. And even then it cóuld be traced when used anywhere. What they can’t get, is your messages. At least not decrypted unless you give it to them yourself. And those are way more interesting. But it’s not even about the goverment per se, it’s for everything from data hungry companies to your old crazy ex.
Telegram sends everything plain text and stores that on their servers. One man-in-the-middle and we got everything you’ve said.
WhatsApp says they have E2EE but is propietary and non-checkable, and from Meta who has a rep for finding ways to secretly and unlawfully grab data. Even if you (foolishly) trust them, they do grab metadata from your messages.
Signal isn’t about it being FOSS, but about privacy. FOSS just means it’s checkable, which is good for security and privacy. They have E2EE not only on message content but also on metdata (unlike most alternatives who only do message contents), do external audits, and are part of a non-profit (which means showing how money is received and spend).