Those are the easier cases! It's when you start diving deeper with the individual linguistic fingerprints that we all have. Some are easier than others. Obviously, this isn't really enough to go by on its own, but when combining with other data the user has posted could prove to be useful. I think I've only done this a couple of times in the past, and that was back when I was reporting. I remember years back I looked at the type of language this alt ring was using, their login times, and all sorts. If my memory serves me correct they didn't have any addresses posted publicly. They were then banned. I've yet to do this as a moderator though as it just takes so much time, and without any other data backing it up its a waste of time.