On a small IRC network I used to frequent, at one time I set up a channel with a bot that lead to a very similar situation. The idea was that channel ops can see people talk even if the channel is muted (+m). Furthermore, on unreal, you can set auditorium mode (+u) which hides all users in that channel from /names and /who. The aforementioned bot was the only op on that channel and was set up to repeat everything said in the channel for everyone to see, effectively anonymizing it. The problem was, this isn't scalable unless you remove flood throttle from the bot (which is almost always a very bad idea) and there's still the possibility of the person running the bot looking at the raw IRC data to find out who is saying what. It was funny while it lasted though.