Earlier quoted context omitted.
> Completely agreed about the nonsensical first claim. We have many third-party clients for other messaging platforms where privacy and security are a primary feature. I can't think of an any with independent implementations. For instance, have a few third party Signal clients, which work by using the official libSignal . These are not third party clients, but third party GUIs. Use of libSignal on the official Signal…
Does Matrix not qualify?
Security wise, there is interesting work adopting MLS (and I believe key transparency) under Matrix, see https://arewemlsyet.com for example.