Maybe; I don't want too be too cynical about it, but I suspect many people don't really read it in the first place, and if you're the sort of person posting fake jobs then I don't expect you're really deterred by this.
Good point about not many people reading it, but there was a nice all-caps "NEW RULE" at the top today, so we'll see.
Definitely some people who will disregard rules they know are rules, but I think there's also a lot of people who just thought fake job posts were the convention, and now they'll change behavior.
