reDarkStorm?
What is this? I've been watching some videos from gir489 on YouTube recently, and I've searched, but I've not been able to find where to get a reliable download of this from. Where can I - if it's at all possible, by the look of some of the comments on those videos, he's mainly using it for personal play.
As of now, there is no public Darkstorm hack that's undetected. Last I heard the guy who made it stopped working on it. That could be, or he's using it for himself like you said.
Like tracer319 said. I'd assume that he's using it for himself so he can keep it undetected. If something goes public, it goes viral. Once it goes viral, it's used constantly and it's easier for Steam/TF2 to patch it.