If you use iOS why do you have Freedom, Privacy, Ethics on your bio? Apple is the oposite of those things, it's a fact (and you know it). To be honest, stock Android is just as bad.
Discussion
You understand there are levels of privacy. You could also ask why am I on Nostr is I care about privacy. Or why do I ever go outside if I care about privacy. You don’t know how I use my iPhone and how I keep private. Using Graphene doesn’t make you private when you don’t act privately on the device.
Stock Android is just as bad yes. But Graphene isnt perfect. Degoogle term is a lie. You cant degoogle literal google hardware lol. Pixel phones are made from a company that goes against freedom, privacy and ethics too.
Yup, GrapheneOS on Google Pixel phones has seemed like a temporary strategy that has turned into a permanant one, but ultimately the hardware _also_ needs to be degoogled.
Pine64 and Librem and the two hardware options that seem to be on the right path there, however there is quite a bit of work yet in getting mobile GNU/Linux mobile ready, it's much closer though.