"Formerly anonymous", firstly you cannot be anonymous after someone who is discovered. Second, after being caught breaking the law again would be much harder; the reader has to assume he stopped being a member after his own capture. Lastly, the main character released information to the public directly so his face is know to common people.
Really, I have no ties to any cyber security group.
I hope this clears things up, and if you wish to know more let me know