Features to encourage "nice" usernames?

This is more of a question than a support request.

Does Discourse have any features which can assist with encouraging people to choose friendly and recognizable usernames or display names? I am looking to avoid things like user64768723, which was made all too popular by StackOverflow, unfortunately, or things like UhnSJuhfeiwfwAS

I could imagine several things from showing a small guideline before registration happens to automatic screening of names of undesired patterns. Are there any such features that we can already use?

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