GrapheneOS, a privacy and security-focused Android-based operating system, has posted a series of tweets on X suggesting that Android should introduce frequent auto-reboots to make it harder for forensic software vendors to exploit firmware flaws and spy on the users.
GrapheneOS didn’t choose Pixels. They chose a set of requirements for current/future devices, which are standards met or exceeded by current Pixel devices. You want GrapheneOS on other phones? Those other phones have to meet the requirements. None currently do.
https://grapheneos.org/faq#future-devices