Earlier quoted context omitted.
> without your consent The author mentions getting consent from Apple employees on multiple occasions. If you asked me if you could install spyware on my computer and I said "yes", then of course it would be legal.
I'm rather amazed that it's possible to install software on public computers in the Apple Store. And since it apparently is (or was), that this sort of thing was not happening daily.
10 PRINT "Hello"
20 GOTO 10