Probably because nobody targeted them yet.

cellbrite specifically has grapheneos in its support matrix.

Which demographics do you think run GrapheneOS as a daily driver other than people who have shit to hide? They've definitely been targeted.

...apparently most of HN, judging by these recent threads?

Yeah, I hide that I’m using apps from other spyware apps.

What of it?

You should probably ask the parent commenter. I think GrapheneOS is a good choice even for those that don't have something to hide. Reminds me of iOS, really (in a good way).