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Google plans to begin verifying the identity of all developers who distribute apps on Android, even if it's outside the Play Store, starting September 2026
(android-developers.googleblog.com)
Graphene should be able to run on anything they can run android though? Not sure what you mean
What? Graphene OS only runs on Google Pixel devices.
Even ROMs with wider hardware support like Lineage OS only run on expensive devices too (Or very old discontinued ones that you can't find anywhere and have no firmware or kernel updates).
Run? Probably. Work flawlessly? Questionable. It needs to be built (as with every OS update) for every specific device. The developers only do builds for pixel devices (faq). You can take the source and build it for your device. I have no idea how you'd even begin to do that or what that would entail, but most probably, you'd to be able to add drivers for things like fingerprint sensors or cameras unless you are ok with losing access to some functionalities.
My understanding is that phones are hard to support with one "do all" operating system. Thats why all manufacturers take AOSP and modify it with their own code - specific to each device and make builds for each. A bit different mentality to what we do on PCs, where one build of an operating system will just work everywhere.