Stephenson's pre-cyberpunk first novel, Zodiac, is about an eco-warrior uncovering a chemical company pollution scheme. In Diamond Age, he talks about an air pollution crisis caused by dead nanobot swarms. From what I remember, most of his anti-corporate messaging was strongly tied to pollution but I don't even see that popping up in his later novels and I never really thought of anti-corporatism as a recuring Stephenson theme.