The phrasing of your first question is ironic given GrapheneOS has upstreamed a ton of their security hardening.
replyYou're probably asking if they're able contribute anymore?
Can you link to patches or commits they upstteamed? I'm not aware Google ever accepted any.
replyreply
Nothing in last 5 years; and if we ignore the last one, Nothing in almost 9-10 years. I am not sure how much weight it holds. Now if that's on Google on not accepting stuff that's different matter
replyMost of it is one liner config changes too, not much of actual code.
replyquite a few manufacturers do, specifically in the automotive sphere and ofc samsung etc.
replyin terms of accepting, unless it's stuff like bugfixes to core mechanisms, not really.