There're many impersonators and spammers, I think this tool is useful to deal with such abuse.
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Beta is not really designed for any sort of production use so this means nothing.
Also releasing IP and user agent information to people freely with no identification checks or process on a test cluster may have Legal less than happy over the idea.
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What @JohnLewis. We explicitly disabled CheckUser on June 2nd 2012 with https://gerrit.wikimedia.org/r/#/c/9796/
There was no bug, that was asked internally following discussions with community members having CheckUser on prod wiki.
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I think CheckUser would be useful on beta, because spam is really annoying and beta is in productive use. It is a great place to test new Lua scripts, new JavaScripts and Bots. If there weren't a productive use, we wouldn't need beta. However, spam is a big problem, especially in eswiki and I think knowing the IP of the users could be really helpful.
I agree that privacy is a big problem, because there is no identification, but I think you have to find a solution for this problem anyway.