Nobody forced you to buy an iPhone 6. #firstworldproblems
Placing unwanted signs, dumping junk or having your dog crap on someone's private property are all illegal. If someone was doing that, I'd be calling the Police. How is that even remotely close to what Apple did? If you don't like it, don't buy an iPhone 6.
You really need to come up with a better argument which doesn't rely on illegal activities for your comparison.
What about junk mail? It used to be the case that you could not refuse to receive it. The reason was that if company X wanted you and a million other nameless people to receive notice about their upcoming sale, the post office was bound by law to deliver.
If you didn't want it in the first place, too bad for you. Getting it out of your life became your problem. Now we do have the option to refuse the delivery of junk mail. That gives the owner of the mailbox more control over what goes into it. This is a good thing. Before that, you could argue that your mailbox, that you paid for, was there to benefit all the organizations that wanted you to buy whatever they were selling. You could not say no.
There are people out there who support DoFo. If someone put a sign on their lawn, would they call the cops? I don't think so. For all I know you could well be one of those people. If you liked the sign on your lawn, you'd leave it there. If you didn't, you'd remove it. The same is true for dog shit. There must at least a few people out there who would use it to fertilize their garden, and welcome getting it for free over driving to the Home Depot garden centre and paying for it. For all I know you could be one of those people.
Apple & U2 decided to take up space on your iPod. Too bad if you don't like it and don't want it. You can't refuse. Getting it out of your life is now your problem. That, for the umpteenth time, is what's at issue here.
If you're hung up on the issue of legality, and private property, consider this-
For all the people who paid hundreds for their iPods, don't they have any right to decide what gets stored on them? This is a sincere question, not rhetorical. I know that software licence terms are very biased in favour of the vendor, not the purchaser. So how does it work? Does Apple make you pay them for the hardware but retain control over how it is used? If that's the way it is, then it's the same as the old laws on delivering junk mail. You own the hardware but you don't control it. Your rights are diminished. You must accept whatever company x decides to put inside. Again, don't kid yourself. They are not doing this for your benefit. And if that's the way it is with buying Apple product, then I still won't be buying any of their stuff for a long time.