I took the jump and installed GrapheneOS on my Pixel 9 this weekend. Easiest alternate OS load I've ever done, didn't even need to see a command line. (I've put LineageOS on many a phone and GrapheneOS's web-based installer is amazing).
Loving it so far. I have three profiles, the main 'Owner' with NO google services/app store at all; and two more 'Personal' and 'Work' profiles that have Google stuff that I alone chose to install.
Amazingly GrapheneOS even lets you deny Google App Store itself permissions to install from untrusted sources (in this case, Google App Store itself) -- I was suprised to see installing just App Store triggered attempts to then load: My Pixel, Google Photos, Fitbit(!!? WTF), and a few others, without any confirmation first. Was able to shut that shit down immediately. (I had never, ever installed Fitbit on my previous phones, so there's no excuse to install it "from my previous device" or whatever...)
I hope GrapheneOS spreads to other phone models. And I'm sure Google has a team planning on how to strangle it before it does...