There are lots of evil things that proprietary software companies might
do. Companies put their own profit above the rights and freedoms of
their users, and to that end, much can be done that subjugates
users. Even as someone who avoids proprietary software, I still read
many proprietary license agreements (mainly to see how bad they are).
I've certainly become numb to the constant barrage of horrible
restrictions they place on users. But, sometimes, proprietary licenses
go so far that I'm taken aback by their gratuitous cruelty.
Apple's licenses are probably the easiest example of proprietary
licensing terms that are well beyond reasonableness. Of course, Apple's
licenses do the usual things like forbidding users from copying,
modifying, sharing, and reverse engineering the software. But even
worse, Apple also forbid users from running Apple software on any
hardware that is not produced by Apple.