If you find yourself in a situation were you have to completely anonymise your users is the issue with Moodle or the regime it lives in? Just seems odd to me. Students in a class know each others name and what each other looks like.
Nothing to do with availability of information between students. With today's apps, they have far more ways than Moodle to find each other. It is more a concern for cyber attack and the laws that protect student data. I came to the realization that none of the personal information in my Moodle is of any use to me and I can certainly tolerate the extra step or two for e-mail contacts.
I even tell students not to post their pictures, birth dates and even city/state anywhere online for their own safety and back it up with a horror story or two.
Sorry... unhelpful, but just curious.
It IS helpful as it provokes thought and conversation.