If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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I actually meant to ask at some point whether the Username account would have protection against people changing passwords willy-nilly, but I didn't because, you know... information hazards and all that. Didn't want to give people the idea. But now that it's happened, I suppose I could ask retrospectively: how come nobody ensured some protection against that?
Because in general a forum that's designed to allow anonymous comments would allow anonymous comments and not let people go through the hack of using a separate account for it. The account wasn't created by any moderator but simple by a using who thinks that such an account would be good to have.
While being in infohazard territory: It's not only possible to change passwords. It's also possible to delete accounts.