Not only you use Android OS developed by Google, somehow you choose a less open OS distribution, exposing you MORE to Google and their shit, only because you don't want to use their hardware that happens to actually be as open as it gets, including the firmware?
Why do you choose to die on that hill? It's ridiculous!
AOSP is open source and written by Google. If you strictly don't want Google, you don't use Android. But IMO it's a shame because AOSP is actually good.
You could argue that you don't want to buy a Pixel because that would be giving money to Google, but not giving money to Google does not help the good alternatives, does it? IMO, helping the good alternatives means supporting GrapheneOS. The bigger GrapheneOS gets, the more likely it is that they get to work with major manufacturers (they already work with Motorola, which is great).
If you buy a Fairphone and run LineageOS, you are still running Google code (AOSP) and you support Fairphone who do not seem to care so much about security (otherwise they would meet the requirements of GrapheneOS).