To catch every random person visiting a site you do need to control most of the Tor nodes which is probably affordable for the three letter agencies. To catch

To catch every random person visiting a site you do need to control most of the Tor nodes which is probably affordable for the three letter agencies. To catch one specific guy doing one action one time that he might do hundreds of times without getting caught but he only needs to get caught once to get punished, if you only need to succeed 0.1% of the time you only need to own 0.1% of the nodes, as a simplification. There's also the incredibly valuable chilling effect that he's being found guilty in public opinion of having read the wrong website once. If millions of people read the "wrong" website a dozen times a day for decades, you only need one bust in a couple billion accesses to generate massive propaganda that reading uncensored badthink is and should be punishable.