Cellebrite has an extra column for GrapheneOS, as they seemingly can't unlock it (since ~2 years), compared to all other Android OEM Flavours.

And with GrapheneOS you can relock the bootloader, once you've installed it.

Source:

https://news.ycombinator.com/item?id=41072905

https://discuss.grapheneos.org/d/14344-cellebrite-premium-ju...