There are ongoing coordinated attempts at misleading people about GrapheneOS and Signal in multiple European countries. A consistent pattern are completely unsubstantiated claims about exploits with no evidence. These are contradicted by actual evidence, leaks and their behavior.
Discussion
GrapheneOS is not immune to exploitation, but the fearmongering done in these ongoing attacks on it is very clearly fabricated. They feel threatened enough by GrapheneOS to engage in coordinated attempts at convincing people that it's unable to protect their privacy and security.
As an European I understand well the Graphene ways. It’s not going to be this news that are going to change my mind. My grandmother however will no longer install Graphene. Sad :(