You still haven't told me how to design a technology to be "good intentioned". Technology has no intension it's the people who use it.
It's really disturbing that you automatically assume that technology is evil because who created it and you have a prejudice because it is DARPA.
Design.
Design simply encodes the values of the designer in the physical technology. A virtuous designer will design something which makes good things easy. A nihilistic designer will design something which makes their life easy. It’s unavoidable.
That’s why so much software these days is harmful, the tech world is largely populated with supremacists and nihilists.
(I don’t mean that in any particularly judgemental way. Supremacism is the norm in the wealthier slices of American culture, so it’s unremarkable that Silicon Valley would end up reflecting that. And the competitive nature of funding and hiring self selects for supremacists as well. And for those who don’t tend towards supremacism, nihilism one of the few ways to stay sane amongst supremacists.)
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