The most obvious being open any closed hardware you own, void the warranty, regardless if you actually do anything to it or not. You can't legally buy a copy of windows in North America and install over seas. You can't buy a Dish Net satellite receiver in the US and legally watch it in Canada. You can't legally use most free anti-virus software on a commercially owned computer. That's just for starters.

As for being Fallacious, I can't see how you find it to be that way at all. Apple is very clear in how they want their software to be used. There is nothing grey or secretive in that at all, nor are they being deceptive in how they market it. OS X is for iMac's. OS X is not for other PC based computers.