I do not have any specific critiques about it, although I remember seeing the authors had some follow-up work. But the important caveat about that model is tha

I do not have any specific critiques about it, although I remember seeing the authors had some follow-up work. But the important caveat about that model is that it assumes everyone does nothing. It has been a rather long time since everyone stopped doing nothing, so even if it is entirely correct, it has not been relevant since well before this article was written.