I'd say that's true, and it's one of the reasons I don't think Guest members should be able to do anything but look around. I don't like that they can post or send private messages when there is no way at all to know who they are. Wikitree says all profiles must have a first and last name and says specifically "Do not enter Living or a fake name or alias" so it seems like there should be some way to prevent "names" like this.