As far as I know, it is still reliant on the whims of Google through shenanigans with AOSP, and of course having to use a Pixel.
Linux offers a more solid and independent foundation, and while it is less polished yet, to me it's the only real way out in the long run.
Still, GrapheneOS is a big step in the right direction - hope it wouldn't come across as me being against the project.

Yep, heard a bit about it. Didn't include here because it's still a big WIP.