at least java minecraft does that part right with the offline mode that switches off auth checks. for a real online server you need a login plugin then (makes sense that some form of username ownership verify is needed in that case) but for a secured LAN it is usable by default.
or just go to archive.org and use the wayback machine. newer posts need some fudgery to find the comments since archiveteam snatches content right as it is posted and due to that comments are only reachable via their link