So once again you're back to saying that it provides evidence of another crime. But many people are saying the anonymity becomes a crime itself when in the context of another crime. I'm kind of bothered by that as it puts a liability (or a chilling effect, if you like) on being anonymous, something I do every day and cherish very much as an important aspect of my privacy. Even though it won't become relevant until the day I am (perhaps wrongly) accused of another crime, suddenly it will become a very huge liability if that ever happens.
Now if you say the anonymity crime is "planning and preparing to commit a crime" then that's (sort of) OK. Once again, the anonymity is part of committing a separate crime that I can at least rationalize is wrongful. But if you tell me that the pure anonymity itself is a crime then I'm very disturbed by that.