If GW sells consignment like say a best buy gets its TVs from TV manufacturers etc thats one avenue of them monitoring and enforcing it.
All in all this whole thing is rather stupid and the overall internet reaction is just as stupid. Everyones up in arms yet everyone will be playing 40k this week and the next etc. Some will get fed up and play WM/H or whatever it wont really matter GWs fan base is as loyal as we are whiners.
It's all done the same way GW is doing it.....which is questionable. It just hasn't been challenged recently.
