Improve their games? If you mean by adding on new graphics sure lol but they don't do much else and all Advanced Warfare was, was a reskin with some slightly new physics mechanics ( The jump pack exosuits) and some particle effects, yes, some new weapons here and there but the gameplay hadn't really changed all that much and that's what it's like with all the publishers so they aren't protecting much of an investment lets be honest.
Exactly. Money is being wasted to fight piracy and such. It doesn't work. The antivirus comparison is invalid here. Malware does damage. Even when a new one gets past the AV, it gets updated eventually.
Once a game gets cracked, there is no saving it.
Just look at what Ubisoft did with AC, so much improvement on the game itself.