A lot of companies are voracious about defending their TM. It's smart. Especially when there are so many companies out there that try to blur the lines in subtle ways every day, and so many gullible consumers who fall for it. Did you know that Walt Disney turned down the government during WWII when they asked him to loan out the likeness of Disney characters for use in forest fire prevention PSMs? It wasn't because he was un-American. But Ol' Walt knew that it's easy to lose your IP to public domain if you're not diligent. Smart companies realize that the doctrine of waiver can be dangerous when not defended proactively, especially in the hands of stupid juries and activist judges.
Except for the fact that Walt Disney and his bought and paid for Congressman are one of the major reason that copyright in this country is absolutely broken. The damages they did to the copyright system because Disney didn't walt Mickey Mouse going into the public domain have ruined our copyright system. Yes the system was broken before, and yes it has been made worse, but the Walt Disney Company was one of the biggest setbacks for copyright in this country. Read: http://en.wikipedia.org/wiki/Copyright_Term_Extension_Act
There is nothing particularly interesting about the Pystar case, other than the cahonas that the defendants showed in engaging in their illegal activity. Apple sells their software/hardware combination as a complete package. They are very clear in their intent to do so, and anyone purchasing the license to use the software is bound by those terms. Period. End of story. As a purchaser, your only recourse is to NOT PURCHASE IT.
Except for the fact that I can buy a retail box of OSX Leopard in a number of places, without a EULA being presented anywhere to me before hand, nor requiring me to agree to it or sign anything before handing them my money. THAT is the issue. OSX Leopard exists as a standalone product for anyone to buy, and it is not in any way presented in such a way that it is part of a hardware/software package. Period. End of story.