this change doesn’t mean that Android is becoming closed-source
What will change is the frequency of public source code releases for specific Android components. Some components like the build system, update engine, Bluetooth stack, Virtualization framework, and SELinux configuration are currently AOSP-first, meaning they’re developed fully in public. Most Android components like the core OS framework are primarily developed internally, although some features, such as the unlocked-only storage area API, are still developed within AOSP.
source code for changes will only be released when Google publishes a new branch containing those changes
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No, the Pixels are king because they let you unlock the booloader and lock it back.
GrapheneOS team said themselves that having pixel device trees in AOSP never was a requierment