I should've worded it better, good natured here means good-intention, in which there will be bad intention that we will probably NEVER see (C&D, military secret, etc...)
In this case, what's stopping the scientists and/or funder from misusing/weaponizing this implant?
p/s: guess I'm biased when it's DARPA, since it's US military complex... but hey, I'm enjoying the Internet :D