Backward names are not used for the "server". (I presume that by "server" you mean hosting, which is determined by the `serviceEndpoint` in the DID document rat

Backward names are not used for the "server". (I presume that by "server" you mean hosting, which is determined by the `serviceEndpoint` in the DID document rather than by something in the AT URI, as the article explains.) If you're asking about “app.bsky.” in the AT URI, it doesn’t indicate a server you’re going to connect to. As stated in the post, it indicates a data format. Think of it as a file extension which describes who governs the schema of that JSON. Formats (called "lexicons" in AT) use a reverse-namespace scheme so that formats governed by the same app appears next to each other alphabetically. That might remind you of Java.