Something tells me this goes all the way back to him feeling Bill Gates stole his OS idea and created Windows. Steve was probably tired of people ripping off his game changing ideas for massive profits.
Now you know why Apple is so litigious. Everyone else in the industry is perfectly fine with being watered-down and undifferentiated. That's why everyone else in the industry does not achieve what Apple does.
Jobs said that in a meeting with now former Google CEO Eric Schmidt, Jobs told Schmidt, "I don't want your money. If you offer me $5 billion, I won't want it. I've got plenty of money. I want you to stop using our ideas in Android, that's all I want."
To paraphrase: "I care more about the integrity of my product than about making a buck."
If anything I respect the guy even more after this.