I read over the Dark Pack a few times and it really reads to me like they're aware of just how much of their material is being reproduced without authorization by the gaming community.
I've been seeing some websites (that I once used as a resource site) shut off their content stating they'd been contacted by WW/Onyx. It does definitely seem that they are moving on this, at least to some degree. There's evidence of it, at least.
Fact of the matter is almost any of the WoD MU*s out there don't require a constant book/PDF open to play due to a shitload of content having been ported into the code. This Dark Pack reads a lot like: if you're not with the Dark Pack, we will shut you down for using our IP without authorization, and in joining the Dark Pack, you will have to identify yourself to us. In identifying yourself to us, we will get a better idea of how much of our stuff you're reproducing without approval, and potentially cease/desist you.
If I were a betting man, I'd put some money on that a lot of these MUs are gonna be getting visitors soon.