[betawolf33]

http://clientconfig.immunicity.org/pacs/all.pac

This is essentially just a list of (presumably unblocked) proxies for the sites on their (quite short) list. They don't provide anything aside from ease of configuration (which admittedly might be worthwhile for some).

When the proxies get blocked, they'll have to either find replacements or shrink their list.

[nly]

There's only one proxy, at the top. The list contains blocked hosts to use it with.