Step 1 of installing GrapheneOS for de-googling your life: Buy a Google Pixel phone
Look - I know, I know. I get it. Google allows you to unlock the bootloader while maintaining the phone's unique and excellent hardware security features. The argument makes sense. It is compelling. Other manufacturers do not give you this freedom. I am not arguing about that. I have a Pixel phone running GrapheneOS myself.
However... It is just so very obviously ironic that one needs to trust Google's hardware and purchase a Google product to de-google their life through GrapheneOS. I think that it is a perfectly valid position for someone to raise their eyebrows, laugh, and remain skeptical of the concept either because they do not want to support Google at all, or because they simply will not trust Google's hardware.
The reason why I think that this is "controversial" is because I have seen multiple instances of someone pointing out the irony, followed by someone getting defensive about it and making use of the technical security arguments in an attempt to patch up the irony.