I think there's a distinction between Michelle Trachtenberg, who is a real person with a real birthdate whose age can be determined, and either Dawn Summers or Harry Potter, who are not. But that is really neither here nor there.

As long as people rely on for-profit companies to host journals, those companies will be susceptible to pressure, either legally or in terms of advertising. That's perhaps unfortunate, but it's true. I don't expect any of the LJ alternatives currently being bandied about to be more ideologically pure in the long-term than LJ is. Although I guess it can be hoped that they will have more PR sense.