You mean like iTunes, Safari (in the past), and quicktime were Apple only? Safari used to be available on Windows and iTunes still is. They do let other platforms use their software when it benefits them. So I think it is incorrect to say they only lock to their platform. They do open it when it makes sense to do so.
Indeed yes, Run the utterly horrid virus of a program iTunes on you PC so we can sell you something.
So sweet of them.
I knew a few people personally, including myself that were forced to install that simply to make the stupid iPad actually usable.