because you think it helps Google (unreasonable)

I personally think this can be reasonable if you're the type to talk all about your hardware with people. You might not like promoting Google, so you choose a different device with a different privacy OS because you would rather talk about that to people.

For me, I don't talk about my phone much to people - so I just bought a second hand Pixel 8, put Graphene on it, and popped a sticker over the Google logo. Using a case that's not clear does just as good of a job. I will probably replace it with a Motorola eventually when they start releasing phones with GrapheneOS on it.