Snowshoe took all top 7 in May U.S. CBL

Snowshoe appeared to have been the source for spam from all of the top seven spamming organizations in the May 2012 top 10 for the U.S. from CBL data. Only 3 were traditional ISPs (two cable companies, Comcast and Charter, plus Global Crossing). Snowshoe spam accounted for all but about 5% of spam from the U.S. top 10. And we already knew snowshoe is not just for hosting companies anymore.

At what point is snowshoe spam no longer a temporary black swan phenomenon, and becomes a prevailing trend?