[okanat]

I'm aware. However, it is quite possible that they will only sell Graphene phones in certain countries considering their past behavior.

[tiagod]

They could also just sell the phones with GrapheneOS already, as the final state of a GrapheneOS instalation has a locked bootloader.

I understand this is part of the reason only Pixel phones are supported - the ability to unlock, and then relock bootloader after install is seen as essential by their team, among other features and properties that only present together in the Pixel phones.