"You seem to be missing the point by an utterly huge margin.
Once you pay for something, it's yours."
Well yes, the iPhone is yours. You can do what you want with the HARDWARE - bury it in the ground, use it as an iPod, smash it into pieces, give it away, encase it acrylic and use it as a paperweight. Whatever takes your fancy.
But when you buy software or subscribe to a service the process is completely different. You are buying a LICENSE to copy the software onto your machine's hard disk/flash memory, and then subsequently to copy it into RAM to execute it. And that license may have all sorts of conditions attached (eg. you can only use it for non-commercial purposes, you can only use it on files less than X big, you can only use it for 30 days, we can revoke the license at any point, you can only use it while you maintain a subscription for service Y, etc.).
It's very, very simple. If you don't like the terms of the license, don't buy the license and agree to its terms. Plenty of people do, and are very happy with the results. Plenty of others don't, and that's fine too, but no need to scream and shout about it so.
And yes, if Apple do revoke the license to use a particular piece of software for any reason, OF COURSE they will compensate you by refunding your purchase price. Apple may be money-grabbing bastards (you do realise it's a commercial company whose goal is to make a profit, right?) but they're certainly not stupid.
A better analogy to a car dealer removing your car stereo without asking might be something like Sky Plus, where I'm pretty sure they can revoke your right to watch something you've recorded over the air if they choose to.