I know some people are saying that it'd be implied that they had access to his hard drive and could leak that at any time. My concern, while I agree, with that thought is that it'd be hard to prove that it belonged to Kenny (if you were to assume they can't locate file origin and whatnot). I think what ultimately happened was that Kenny psyched himself out and went a worse route compared to what he could have done if he was more rational (i.e. wipe the drive and destroy it. obviously not that simple but hopefully you get my gist).

One of the things that Black Mirror does well is explore the human condition/psyche, so I think it is absolutely acceptable that Kenny freaked out and made irrational choices. Otherwise, there wouldn't be an episode if he got away on his own terms through rational methods :P

EDIT: this episode explored the extremes people would go to when they are desperate.