They are open-core. The offline-write feature (libsql::Builder::new_synced_database) basically does not work with the bare `sqld` server on their `libsql` github repository.
In fairness though their `libsql::Builder::new_remote_replica` works with the bare `sqld`
In fairness though their `libsql::Builder::new_remote_replica` works with the bare `sqld`