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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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It lacks the resources to provide production quality releases and to quickly restore all of the past privacy and security work for Android P. However, it's progressing, and time taken to write a completely new hardened allocator already makes one part of it substantially better.
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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.