Weird Usernames

For a quite long time, I’m seeing this type of username that starts with vjudge3.40.... I tried clicking on them but those didn’t redirect to anywhere.

So, I’m wondering what are these actually?
Why are the usernames like that?

These submissions were made by Vjudge. It is a virtual judge service. Virtual judge service can contact Toph to get these special accounts that has reduced rate limitations. Naturally these accounts do not have profiles associated with them. For example they do not show up on leaderboards.

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