Until someone doesn't like one of your posts and reports your account as a fake. Then it gets locked and they make you scan your drivers license and send it in. I've seen this happen to people who do things as innocuous as put a nickname between their first and last name.

Sure, but then you create another fake account. In any event, my original suggestion was for people who simply wanted to silently join groups to read info, and/or avoid annoying login requests.