I'd be interested to know statistics on Tor usage. I get that people espouse it's intended legitimate privacy purposes, but I would expect that even the most ardent supporters would acknowledge that it's probably 1% "legitimate" use and 99% illegal or gray-area use (the latter being things like torrents, or porn that's not illegal but embarrassing if people knew about).

I wonder at what point the supporters of Tor would continue to support it. What if it were 0.0001% genuine needs for privacy, and 99.9999% illegal stuff?

Perhaps I'm totally wrong though. Do such statistics exist?