https://simplex.chat/ has lesser metadata than Signal[1][2], Matrix and XMPP. SimpleX Chat is going to move to Groups V2[3] very soon to make the experience much better.

[1]: https://www.ndss-symposium.org/ndss-paper/improving-signals-...

[2]: https://arxiv.org/abs/2305.09799

[3]: https://github.com/simplex-chat/simplex-chat/issues/4620#iss...