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RattlesnakeOS and #!os are NOT forks and are not developing privacy and security hardening features. The AndroidHardening project is not a fork either. It's the original project by the original development team, although it has been rebooted for Android P to do everything better.
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They aren't the same thing. RattlesnakeOS explicitly doesn't include hardening. It's a set of scripts for making signed builds of AOSP on AWS. The #!os project is also focused on making scripting for building, aimed at making it easier to do reproducible builds, etc.
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The original project is a privacy and security focused variant of the Android Open Source Project by developing substantial privacy and security improvements, and it's continuing. Due to the disaster that occurred, it was rebooted for Android P to do things in a better way.
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It also now supports the Pixel 3 and Pixel 3 XL, which were never supported when it was branded as CopperheadOS and are not supported by the poorly maintained and incredibly insecure fork of the old work by Copperhead that has replaced the old CopperheadOS.