GOS => security, usability
LOS => most security, most usability, breadth of support
LOS => most security, most usability, breadth of support
GrapheneOS greatly improves upon the increasingly inadequate privacy and security provided by Android. It fixes many privacy and security vulnerabilities along with adding important missing privacy and security protections.
Traditional cell phones lack any form of secure communication and are entirely dependent on cellular. Those lack basic updates and security protections in practice too. Those are the opposite of a more private and secure device. A smartphone with GrapheneOS or iOS is far more private and secure than any traditional desktop/laptop computer at a hardware, firmware and software level.
There's nothing illegal about using GrapheneOS.