alt Hacker NewsTheir license is invalid due to being GPLv3. GPLv3 cannot be included in GrapheneOS as that would necessitate GrapheneOS give up their permissive licensing.
Refra Gallery is licensed as Apache 2.0, which is a permissive license GrapheneOS can bundle in the OS.
Its not part of the OS so why would it affect the Graphene OS license? Its an app, not a library.