It's not dead in the water though. After weighing up all my options, I decided buying a Pixel and immediately putting GrapheneOS on it was better for my privacy and security than getting another non-Google phone, and going through whatever processes required for whatever de-Googled Android ROM on that phone.

I don't like giving money to Google, but when I weighed up all the options this was still the best course for me. Of course, this is just my experience and reasoning.

Besides, it sounds like GrapheneOS is in talks with other OEMs so we may see support in other non-Google devices!