@m you might want to double check on Matrix though:
https://soatok.blog/2024/08/14/security-issues-in-matrixs-olm-library/
Matrix is a decent IRC replacement, but a secure messenger it is not. I've always felt that encryption was bolted-on as an afterthought in it and that that will lead to tears, and as time goes by I get more and more proof of this.
@FediThing @m I don't have strong opinions on it other than when I tried XMPP the usability was always an issue.
I know there are projects like Snikket that made great strides on this front though.