At the core of property ownership lies the right of exclusion – the ability to exclude or include something on one's personal property. This right is quite important and can even be used to derive most other property rights; please see the linked paper at the bottom. However, Apple's policies with iDevices violate this fundamental right by controlling what software can run on the device, even before someones does anything with their device they bought. They do this not via legal means but by using cryptography to reserve the right of exclusion for themselves (they claim its for your security though...). Part of the problem is when someone sells something that in most cases that means a complete transfer of all property rights to the buyer, but Apple is preventing that via extralegal means.
Consider this scenario: you purchase a new iPhone with the intention of not even using iOS and installing something like Linux. However, Apple's control over the boot-ROM prevents the hardware from booting any unsigned code without even opening the box. This gives Apple the ability to exclude or allow software to run on a device they no longer own. The thing is, Apple legally does not have the right of exclusion, but only reserves it via cryptography. This effectively restricts the exercise of your own property rights since you no longer can fully choose what to include or exclude from execution on that ARM processor you own. The fact that this control persists post-sale demonstrates a blatant infringement on individual property rights from Apple.
In summary, Apple is intruding upon individuals' personal property rights, notably the right of exclusion. Through the use of cryptography after purchase, Apple retains the right of exclusion which lets them determine which software can and can not operate on a device they no longer own.
For a more in-depth exploration of the right of exclusion, I highly recommend reading the paper titled "Property and the Right to Exclude" [https://core.ac.uk/download/pdf/33139498.pdf].