> meaning no data is accessible to third parties--unlike Matrix, which is federated
I acknowledge that this isn't an option for everyone but for the HN crowd, it's fairly easy to run your own homeserver. You just need to install Synapse [0] (which has a convenient Docker image [1]) and give your server a domain name.
If you do this, your metadata will only be accessible to yourself and the homeservers of your contacts (who could share your server or run their own).
Message contents are usually e2e encrypted, so the homeserver you use is irrelevant.
I acknowledge that this isn't an option for everyone but for the HN crowd, it's fairly easy to run your own homeserver. You just need to install Synapse [0] (which has a convenient Docker image [1]) and give your server a domain name.
If you do this, your metadata will only be accessible to yourself and the homeservers of your contacts (who could share your server or run their own).
Message contents are usually e2e encrypted, so the homeserver you use is irrelevant.
[0]: https://github.com/matrix-org/synapse
[1]: https://hub.docker.com/r/matrixdotorg/synapse/