Enlarge / Graphene is a remarkable allotrope, deserving of further study. GrapheneOS is a remarkable ROM, one that Google does not quite know how to accommodate, due to its "tiny, tiny" user numbers compared to mainstream Android. "If it's not an official OS, we have to assume it's bad." That's how Shawn Wilden, the tech lead for hardware-backed security in Android, described the current reality of custom Android-based operating systems in response to a real security conundrum.