Well both GregT and RichyG both have put malware into their code in the past to stop players from using their mods.
I don't think you quite understand what "malware" is. From dictionary.com: "software intended to damage a computer, mobile device, computer system, or computer network, or to take partial control over its operation." The code that is in IC2 and GregTech to prevent them from being used in offending modpacks does not damage the computer or its network, nor does it take control over its operation. It simply deactivate the mod in that specific modpack. Stop making false accusations that blow things out of proportion; it makes you seem very immature.