Not this narrative again. There are many people who don't fit in those groups who use GrapheneOS. For instance, because they like vanilla Android (which barely exists anymore outside GrapheneOS and perhaps Lineage), their phone not to be preloaded with all kinds of adware (including forced AI assistants), like a phone that is not controlled by big tech, etc.
Some of those people will also buy a premium phone because they want to have a great camera system.