I don’t really have a stake in this race because it’s quite a dilemma (personally I like the idea of Graphene supporting more devices with varying security promises) but I’d imagine between buying a 2nd hand Pixel or exclusively using Google services, Google would rather people do the latter.

They simply make more out of data gathering and GrapheneOS sidessteps that, so as a user I’m leaning towards the former so I can more readily degoogle myself.