people need to think
Apples OSX on Apple computers is a monopoly, true, but it is not a monopoly in the legal sense. In the same way Kellogg’s cornflakes in a Kellogg’s cornflake packet is a monopoly, but there is not legal case to make Kellogg’s sell its cornflakes to go into a Tesco own brand box.
In both cases you can put other things in the box (computer/packet), and you can put the contains (operating system/cornflakes) in a different box, (I'm ignoring that compatibility issues and EUA). if you want Kellogg’s cornflakes you have to buy it in a Kellogg’s box and pay what they are asking, same with Apples OSX.
Having said that Apple is selling OSX on its own, and then crying when people install it on computers that are not Apple, and saying it’s against the license. Back to my Kellogg’s analogy it’s like Kellogg’s selling just cornflakes then crying when Tesco put then in an own brand box and say look cheap Kellogg’s cornflakes as it’s not in the licence, despite the fact you can’t see the licence until you start to eat the cornflakes.
Oh I’ve called it Apple OSX as it does belong to Apple, a lot if it is open source I know, but not all of it. Anyway the real question is are EUA legal and why does only software have them? though films are trying to get them as well (DRM), music is beginning to give up.