I should try and find out why it actually exists, there doesn't seem to be much use for it as while opers can view, and in some cases, change usermodes for other users they have access to /shun command which is stealth. Aside from a user being able to block themselves from talking I can't see a use for it.
There's every possibility that it's a self-inflicted way of overcoming an IRC addiction, who knows lol.
