You can dot his but it won't be Graphene but something else, like LineageOS. As long as Graphene's selling point is extreme privacy and not just more privacy, it will be this way.
There is no such thing as extreme privacy; it isn't something any phone can provide, especially if you are going to rely on third party software and services like email and instant messengers where the likes of Google and Facebook are dominant players. Even behind a VPN, Vanadium is fingerprintable by commercial trackers like fingerprint.com. Short of disabling Javascript, browsers leak enough information to basically follow anyone around the internet.
There is no such thing as extreme privacy; it isn't something any phone can provide, especially if you are going to rely on third party software and services like email and instant messengers where the likes of Google and Facebook are dominant players. Even behind a VPN, Vanadium is fingerprintable by commercial trackers like fingerprint.com. Short of disabling Javascript, browsers leak enough information to basically follow anyone around the internet.