It was made by random players, not by Epic
Besides, dust2 has been ported to tons of different games. People have ported it to cod2/4 and quake 3 back in the day. It's one of the most well recognized maps in FPS
"I wouldn't have realised it wasn't Counter-Strike if it wasn't for those radioactively green trees. The architecture, the colours and the general grunginess of it all are spot-on."
wtf it has completely different textures