Restricting details in privacy-related research to prevent abuse
From a practical perspective, even if you omit the implementation and mathematical details from your paper, large companies like Google and Facebook, or state agencies have significant amounts of manpower and talent. And if they really wanted to they could probably get very close to the results that you are obtaining in a short period of time. 

So it is unlikely that any obscuring on your part would halt these entities from following through with whatever agenda they have. On the contrary, omitting too many details will only make it harder for you to publish.

On a more philosophical note, any machine learning model can be used for good or for evil. Linear regression models I'm sure have helped people to win wars as well as eradicate diseases. As a result, one can easily argue that any attempt to prevent abuse is equally preventing progress in other domains.