Tor is an application and technically doesn’t even has much to do with Linux itself, except that it also runs on it. Where you using a guide for installing and if so which one?

It is federated though? It’s literally the first sentence in their specification: https://spec.matrix.org/latest/

Both have their own instances: https://social.bund.de and https://social.network.europa.eu

https://matrix.to/#/#lemmy-support-general:discuss.online