Probably they are not really after the data here. This is way to intimidate people and to discourage others from participant in projects which are not appreciated by the US officials.
This kind of publicity is actually beneficial for the officials. More people see what kind of trouble you maybe get into should you start contributing to Tor or other similar projects.
This kind of publicity is actually beneficial for the officials. More people see what kind of trouble you maybe get into should you start contributing to Tor or other similar projects.