Every iPhone ships with a chain of trust that starts with Apple’s root certificate, not yours. The kernel you run, the OS you update, the apps you install — all gatekept through keys Apple holds. This is sold as security, but security means nothing if only one party controls the locks. Android has its own chain of Google-verified boot, which is the same architecture with worse transparency. Both platforms decided that your device belongs to whoever signed the firmware. Free software means you can audit, modify, and share what runs on your machine. That requires unlocked boot chains, not just open-source kernels running inside a proprietary trap. Why should the device you bought be the only one you don’t control?