Lianne, I see that-- the email option is available for non-anonymous as well. Still doesn't answer why WikiTree allows anonymous users.
Also I'm beginning to think that there's a firewall of some sort between g2g and wikitree-- i.e., they are two completely different systems. I didn't get that at first. Even if that's true, anonymous users, even if only on g2g, seems counter to the collaborative nature of WikiTree.