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Any tool that calls itself “open source” and uses proprietary encryption that they refuse to let any neutral third party review, should absolutely not be trusted.
It’s open standard, not open source
Signal > Matrix/Element > RCS > SMS.
iMessage isn’t in the equation because it only works on a single platform.
signal protocol is basically the opposite, open source but the company is hostile to 3rd party client development
There’s a few clients for Signal, nobody is preventing developers from creating apps; there’s Molly, gurk-rs, Axolotl, Flare, signal-cli, Pidgin (with the Signal plugin.
The problem is 3rd party clients don’t implement all features because it takes a lot of work and they’re created/developed by volunteers - just take a look at Matrix and how many clients support all features or even just group end-to-end encryption (E2EE). Last I checked many third party Matrix clients didn’t support encrypted group messages, primarily just Element, the reference client built by the matrix developers. So you have the same problem on Signal that you have on Matrix.
