Most, if not all, of the commercial nannyware vendors will have blocked the anonymising services.
FWIW, I've found that several of these packages block my site -
http://vintagebus.com
What's scary about the nannyware stuff is not that they block sites like Pelican and whatnot, but they also selectively non-entertainment sites. Various political sites of one orientation will blocked, but bot those of the other persuasion. Their block lists are closely guarded "trade secrets." This gives them a tremendous power that people don't even realize. The new trend in social, political and economic control is to quietly filter what you don't want people to see. Microsoft is famous for mangling competitors products.
--Mulder