http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/115-two-hop-paths.html
These users use Tor to
circumvent aggressive content filters, or simply to keep their IP out of
marketing and search engine databases. Most content filters have no
interest in running Tor nodes to catch violators, and marketers
certainly would never consider such a thing, both on a cost basis and a
legal one.