Nostr doesn't provide a matrix alternative. Nor does it (yet) solve the spam / gore problem.

Despite these issues, matrix remains the gold standard for encrypted community chat

We moved from an open matrix instance to a closed one to protect our members, and we will only federate with trusted servers

The downside is that all users are added manually.

We'd love to build an auth server into matrix that uses Nostr - if there are any sponsors out there, do get in touch