Bluesky post by @gabboman.at.app.wafrn.net saying: "Thanks a lot to @rudyfraser.com for hosting the blacksky PDS. After confirmating thatis ok, wafrn now uses blacksky's relay! In the next update other wafrns may also use the relay"
Right now federation between atproto and activitypub is opt in (and not developed by the big platforms such as bluesky and mastodon) with bridgyfed.