With any technology used in the support of freedom, especially in oppressed countries, the technologist has to ask 'How can the bad guy turn this around?'.
USB has been a common vector for viruses. North Korea is rumoured to have a passing familiarity with creating cyberweapons. So they could intercept the USB sticks, infect them, and then let them get redistributed. Then all these people will use the sticks, the virii will call home with personally identifying information, and NK will either jail or closely watch the people you are trying to help. And that assumes that this effort isn't wholly an op by NK.
With any technology used in the support of freedom, especially in oppressed countries, the technologist has to ask 'How can the bad guy turn this around?'.
USB has been a common vector for viruses. North Korea is rumoured to have a passing familiarity with creating cyberweapons. So they could intercept the USB sticks, infect them, and then let them get redistributed. Then all these people will use the sticks, the virii will call home with personally identifying information, and NK will either jail or closely watch the people you are trying to help. And that assumes that this effort isn't wholly an op by NK.