No, they would just sign up with a new alias, wait, then join the server, wait, and then do it again. Most servers should not do this. But for situations like ours, a small RP server being harassed, it was useful for the year it was up. The users would not have been okay with that if the entire server wasn't a close community of about 20 people. Its just another example of a thing that can protect extremely small teams conveniently being abused by bigger entities to get something they want (your data).