Yeah, but they weren't the first to wildcat them, were they? So, my argument is still completely valid.
Anyone can do anything if they've got the time and money to invest. Whether it's completely useless or not is up to the consumers.
I can't speak to the date of the original 300 PRC design, but I have a copy of the original 338/375 Hornady Match reamer print dated October of 2009. It matches the dimensions of a 300 PRC necked up to 338. I got it back in January of 2010 while working on the 338/375 Ruger (375 necked down with no other changes). It's reasonable to assume that they were also working on a 30 caliber version at the same time. Since they had access to the 375 Ruger case dimensions before anybody else did, it seems pretty likely that they were the first to neck it up and down to various dimensions.