The requirement for knowing about criminal activities is intentional very high. If it wasn't, almost every internet based service would be deemed illegal. ISP and online market places like Amazon can not claim they aren't aware of fraudsters, but they still a necessary tool in the crime.
During the Pirate Bay trial, the requirement was set to "primary usage". They took a screenshot of the top 100, and sad "obviously, the site founders know that the primary usage was illegal" which the court then accepted. Arguing that same for tor is sketchy at best, and there is government organizations, researchers and developers who would argue that the primary usage for tor is as a privacy tool for non-criminal activities. I also suspect that they would have plenty of evidence to back it up.
During the Pirate Bay trial, the requirement was set to "primary usage". They took a screenshot of the top 100, and sad "obviously, the site founders know that the primary usage was illegal" which the court then accepted. Arguing that same for tor is sketchy at best, and there is government organizations, researchers and developers who would argue that the primary usage for tor is as a privacy tool for non-criminal activities. I also suspect that they would have plenty of evidence to back it up.