"Terms and conditions" often contain more than just restrictions on copying, they can have everything from arbitration clauses, through anti-interoperability clauses, to obligations that go directly against local laws.
If I buy an apple, maybe I want to eat it. Perhaps I'd like to smoosh it under my boot. Maybe it goes up me bum. Now what does a magic apple copier have to do with me putting apples up my bum?
how do you recoup your investment then when making software? wont everyone just pirate/duplicate it?