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GrapheneOS says Google is making life harder for rival operating systems and devices
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Graphene is Pixel only and aims for privacy and security.
PMOS aims to bring Linux to the maximum amount of devices (phones, Chromebooks, tablets, QEMU) to give them a life beyond the manufacturer's support.
I would compare PMOS to LineageOS over Graphene.