> they are making the source available

Not in the preferred form for modification expected by the build system and not in a reasonable amount of time. It's artificially delayed with no legitimate reason.

> And the number of people who buy new Pixels to immediately install GrapheneOS on them is (no offense) negligible

Nearly all of our current users bought a device specifically to install GrapheneOS. Our current userbase is around 500k and many of those are users had one or more earlier devices with GrapheneOS. Our userbase is rapidly growing. Look up how many Pixels are actually sold in a year. It's not negligible at all.

There are also many large companies wanting GrapheneOS devices with official support from the OEM.