You made me wonder if there could ever be an avenue for Apple to support this, especially with Google just getting worse and worse with android.
Apple makes a ton of money on just hardware sales. Imagine if the next iPhone had an option that would delete iOS, possibly blow some kind of security fuse in the CPU that voids your warranty (because they still have to be dicks), and reboot into an unlocked bootloader. They could boost sales and be even shittier to Google by rolling their own distro of Linux/Android/BSD for the phones with solid drivers for everything.
That veered off into fantasy land immediately, since that is not how Apple does things. And they do have services to sell too. But even if they only enabled open access on older models it could move a ton of units. Interesting to imagine.