Seriously, it's impossible to engage on a thread where there are multiple posters called "user" followed by however many numbers there are. And most of them refuse to name change
Surely given that you can't or won't do something about whatever it is that's generating these random nicknames the alternative is to put something in place which means that the poster either can't post until they have a proper username, or limit their postings to say, two or three before they have to change.