But you can install other OSes such as Graphene on Android phones, I dont think you can do that on iPhones can you?
Painting Apple and Android devices with the same brush in this particular regard doesn't make a lot of sense.
Also, I'm curious... can you really install an OS besides Android on a Pixel, etc? AFAIK it's just different distros of Android, it's not like you could install BSD or something, right?