Basically, it tries to port everything from Graphene that can be ported to a standard phone, but some of the more stringent security measures (like the enhanced memory attestation) could not be ported as they rely on hardware available only on Pixels at the moment (and this is why the original developers of Graphene were unwilling to create such a version, as it could give a false sensation of security on unsupported devices)
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What's to stop one from buying a used Pixel? No money goes to Google.
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