Has Tor tried to do anything to reduce potentially unnecessary use of their bridges? Maybe I'm being naive, but I think some teenager using Tor to pirate stacks of blue-ray movies should have to wait in line behind a Chinese civil rights blogger.
Tor is unbearably slow for large downloads, so almost anyone is discouraged from doing so. There's also no reason whatsoever for a teenage pirate to need a bridge server, since their access to the standard servers is unimpeded.
The whole point of tor is to let people say things other people don't want them to; a system that decided what could and couldn't be sent over it would rather defeat the point.
