“…The challenge of the Tor anonymity network, as intimated by its dual use nature, is that maximal policy solutions all promise to cause harm to some party. Leaving the Tor network up and free from law enforcement investigation is likely to lead to direct and indirect harms that results from the system being used by those engaged in child exploitation ( 7 , 8 ), drug exchange ( 9 – 13 ), and the sale of firearms ( 14 , 15 ), although these harms are of course highly heterogeneous in terms of their potential negative social impacts and some, such as personal drug use, might also have predominantly individual costs in some cases. Conversely, simply working to shut down Tor would cause harm to dissidents and human rights activists, particularly, our results suggest, in more repressive, less politically free regimes where technological protections are often needed the most ( 19 , 20 ).…”