You can see the individual pull requests for how many people have worked on the app and that there's people discussing what to do. There's people involved in every step or the development testing for quality. Here's the largest:
https://github.com/GrapheneOS/Messaging/pull/109
The leading apps dev has around a decade and a half of experience in developing on the Android platform alone. His contributions so far have been incredible.
We have a broad access to many LLMs for security testing, including cyber-enabled models for dual-use. It's not actually writing the code of GrapheneOS much. It would be poor to willingly dumb ourselves down when companies such as Cellebrite are devoting teams to creating AI tooling to reverse engineer mobile devices to try and exploit them.
