Over and again people on HN make the following argument: "Google is a company that makes most of its revenue from ads and surveillance. Therefore, you should always assume that Google is spying on you". But somehow when it comes to Pixel people give it a pass?
Prediction: If Pixel isn't already hardwired to phone home and report on your activities, it will slowly become so over time, as Google realizes its interest. You know, as it happened with Android, Chrome, and everything else that Google touches.
They write about their reasoning and criteria for device support here, for example: https://grapheneos.org/faq#future-device.